Tour the Rainforest room as it's much larger than the one on the Magic. If you like what you see then purchase a pass for the entire cruise so you can come and go as you please. I agree with Disneytravelers2008 that it's a lot easier getting changed and using their showers vs.the ones in your room. I found out recently that you don't need to have a pass to use the showers/locker room so keep that in mind as well. They also have the fancy Elemis products which concierge-level gets.
The pastries served in the Cove Cafe are free! I made this mistake and in the evenings they have prosciutto, breads, assorted cheeses, meats and olives.
Lay on the comfy throwback deck chairs on the promenade and take it all in. It's even better at night and usually very quiet.
Ride the Aquaduck