The Forest for sure, assuming that magical deep rest works even on my ME/CFS. Can't do any of the others without my health anyway
If I wasn't sick, though, I'd pick the shop. For stress relief sometimes I enjoy making massive wishlists of items I never actually buy, and this is like the upgraded version of that. Just seems like it'd be fun to wander and marvel and gather and choose... Plus it's the one that is most likely to be helpful to your outside life and other people you care about.