Some secrets exist in Coldhaven ...
If you need help and don't mind having surprises ruined (spoilers of course) then you can look on this page for information.



Click to enlarge these Tamriel maps which shows the location of the entrance to Coldhaven.  The entrance is due west of Honeystrand Cave; walk south from it a bit and head up the mountain to the west as soon as you can (it's past some trees in a snowy area).  It is labelled as "Vampire Shrine" upon first discovery, but changes to "Coldhaven" when you find the city itself.

https://sites.google.com/site/coldhavenskyrim/spoilers/ExteriorCell.png?attredirects=0    







Click to enlarge this map of Coldhaven or map of the Sewers (exported from the Creation Kit) :
(some secrets are not marked on these maps though ...)
Sewer grates are located throughout Coldhaven (one is right beside the Chalice and Lancet).  Some sluice gates in the sewers may not open until you progress through the main quest with Tamara.







Teleport platforms
will become visible and usable only after you drink from the fountain of Molag Bal - it is located at the base of the Sovrena's Tower.  They can be used by your followers ... but since the "doors" are flagged as 'Minimal Use', followers will often run and use doors instead of teleporting with you instantly - they will catch up to you, don't worry.  (see http://www.creationkit.com/index.php?title=Door)




Main Quest Details

NOTE:  You SHOULD do the quest stages in order ... 
If you read Dalaran's journal in his tower before reporting to Tamara (Stage 50) then it used to bypass rewarding you Lamae's Rest.
This is fixed as of version 1.6

Click this map for exact locations:

STAGE 40    Find Dalaran            
Sovrena Tamara mentioned that one of the founding members of Coldhaven has disappeared.  I am going to try and find any information about Dalaran that I can.  I assume I will be richly rewarded for my efforts.
STAGE 50   Report to Tamara        
* This is the stage where you get the key and ownership to Lamae's Rest.
I have, unfortunately, found the body of Dalaran in the sewers below Coldhaven.  I appears that he was killed by a deranged Argonian vampire.  I must report what I have found to Sovrena Tamara.
STAGE 70    Investigate Dalaran's Research        
Sovrena Tamara has asked me to try and find out why Dalaran was in the sewers.  He must have been trying to research something  ... but I don't know what yet.
STAGE 80   Report to Tamara       
I found several journals in Dalaran's tower.  He believed that some Dwemer were experimenting on vampires in an attempt at life transference long ago.  He wanted to search the mine and the sewers in more detail.  I should tell Tamara what I have found.
STAGE 100    Continue Dalaran's Research       
I now have the key that Dalaran gave to Sovrena Tamara to keep safe.  I will continue his investigation into the strange Dwemer activity in this area.  Somewhere, there is a chest or door that this key opens, and I am going to find it!
STAGE 110    Tell Tamara About the Secret Lab       
The key opened up an abandoned Dwemer research lab!  It's too bad Dalaran wasn't able to see it.  The Dwemer here seemed to be working in isolation.  They did find how to drain life from victims and transfer it to themselves, but it wasn't a complete transfer.  Still, I am stronger than ever now.  I have to tell Sovrena Tamara about this!
STAGE 130        COMPLETE QUEST       
I'm glad I was able to provide closure for Sovrena Tamara and the citizens of Coldhaven.  Dalaran didn't deserve to die like that, but all of his research wasn't in vain!  I hope the Dwemer Laboratory he helped us discover reveals its secrets in time.           




Dalaran's body can be found in the large cistern, which is part of the Coldhaven sewers.  The area is guarded by a somewhat mad Argonian Vampire ... so explore with care.  You have to access the cistern though the flooded tunnels.  Dalaran's ring will allow you to teleport to his tower when it is equipped.  Inside his tower is more information about Dwemer history in these caverns that he was studying before his death

Dalaran's Ring will let you teleport to his tower at any time upon equipping it.  He has a teleport rune at the top of his tower which takes you instantly to the Noble's Plateau.  As of 1.6 you can use the MCM to change the destination of the ring to Dalaran's Tower OR Lamae's Rest (if you own it).

Lamae's rest can be your own personal player home if you choose it as a start with my Alternate Start - Live Another Life plugin, OR if you find Dalaran's body and report back to Tamara what has become of him.

The Vampire Thrall cage in Lamae's rest can be raised and lowered using a small button on the left wall by the statues on the shelves; it's a round button on the pillar - I made it to blend in.  The thrall is a bit of a cheat ... she is essential and her stats will be reset each time the cage is lowered again so you could technically feed on her forever.  Try not to abuse this though.

The door behind the waterfall in Coldhaven (past Sicara's House) cannot be opened from the outside.  You must enter a Dwemer lift in the sewers to find a hidden room (the key to this lift was given to Tamara for safekeeping).  You can then open this door from the inside and exit to Coldhaven.

The Biomechanical Heart in the Abandoned Dwemer Lab has to be primed first, then activated.  It drains the life force from the withered victims in its storage compartments and concentrates it.  Activating the heart transfers the health (+100) to you.

After finishing the main quest, "A Founding Father", the Noble Houses of Coldhaven will be much more open to talking with you and they may ask you to join them.  Who you decide to join will affect your stats as a vampire.  The Vampire Houses in Coldhaven can grant you increased stats and allow you access to their home as a faction member.  Your selection is permanent!  Choose wisely.
HOUSE QUARRA - Grants +20 Stamina, +10 to Heavy Armor, One-handed, Two-handed, Block
HOUSE AYDRIL - Grants +40 Magicka, +10 to Enchanting, Destruction, Illusion, Alteration
HOUSE TARBONNIS - Grants +20 Health, +10 to Light Armor, Sneak, Lockpicking, Speech

Each Noble House of Coldhaven has a secret room where they store valuable weapons, spells, etc. - try to find them all.

The Coldhaven Sanctuary for the Dark Brotherhood has a shrine to the Night Mother in it.  She will be silent unless you have already become the listener.  You have access to "The Dark Brotherhood Forever" through this shrine to the Night Mother.  It is a radiant quest that repeats itself indefinitely. This quest automatically starts upon the completion of the quest "Hail Sithis!.  (http://elderscrolls.wikia.com/wiki/The_Dark_Brotherhood_Forever)

The treasure room in the Sovrena's Tower is inaccessible at this time and is just for show.