I usually build a quick base at the border or just inside the swamp. Having a roof, fire and bed make things easier. Once at the mini base make that bed your spawn point so you are not miles away if death happens.
When searching to find the crypts I use a pattern from the base. Head out along the right edge in as straight a line as possible the move left and return toward the base. Out and back until you've found crypts then mark them on the map.
Once entering a crypt make a fire, it's a good way to keep your rest up while in a damp, dark place fighting druagrs