Originally posted by Hobo Misanthropus:

It may seem like with the constant rain you can only rest inside Crypts (And this is a valid strategy) but basically any object that occludes the sky will protect your fire and yourself from the rain.

Good that you bring this point up as it is very important. When I do swamps I ALWAYS carry stuff to make a fire and I always place it in the entrance of the crypts before I enter it to get that wet debuff away and also for refreshing my rested bonus if it runs out.