All the resorts are free to visit. You can drive or take the Disney transportation with your passes. Many people explore the hotels when they have PS's in the various resort restaurants. If you mean actually checking out the rooms in the resorts, I don't know if they give tours of those since I've never asked.
You'll wind up the same as me, lol. I like so many I can't seem to make up my mind about where to stay next. At least with a family of five, my choices are narrowed for a one room stay.
Have fun.