little spoilers
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First make sure you keep all keys and symbols and stuff which seems useless because you will need them to access some areas later in kresslacks tomb..
There are five small tombs in vale of shadows... and the sixth one is the main one in upper right corner which is kresslack's (sic?) tomb, which you shoud visit after you finish the other five...
the tombs are:
1. Go straight esat from your starting locaion till you find it
2. Go south from your starting location... midway turn east and then little north
3. Go all way south from starting location then all way east... on entering the tomb a skeleton will ask you to stay out but you just stay in and kill him....
4. go west of the 3rd tomb... you will find a way leading north... ignore it for now as that will lead to kresslack.... a little more west you will find a second way going north, go there till you reach open area with a praying statue in the middle... north esat of the open area is the way to fourth tomb.
5. 5th tomb can be reached by taking the passage south west of the open area... this isnt a tomb exactly but just a cave... make sure that once you enter you click on the tents inside as that will tell you that sometyhing else other than yetis inhabit it. Remember this cave as you will need to return here later..
After finishing 5 caves go to north east to kresslacks tomb...this is a large three-levelled tomb so i want spoil you anything there.....
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s for the heirloom: the heirloom will not be in any tomb... it can be found on a yeti chieftain who is in front of the fifth tomb... give it to mirek back in kuldahar who will be standing in front of potters house.
lastly,
consider you might want to visit this
http://www.planetbaldursgate.com/iwd/walk/ if your stuck anywhere