My mom needs to rest as well so I'll share our favorite spots even though you have plenty of great suggestions already
MK: TTA, as many have mentioned, is our fave. If you want to completely refuel yourselves, follow it with CoP. You'll feel so rested and cooled off.. it's great! We also like to hop on the train because it's incredibly relaxing.
Epcot: Again, if you want a long rest: UoE. I'm ashamed to say that on my last visit, I even took a nap in there haha. It's so nice to sit inside, be mildly entertained, and relax for awhile. However, your bum might hurt after awhile :lookaroun Also, as mentioned, lots of great spots in the World Showcase. I love the gardens in the back of the UK pavilion. You almost forget you're at a crowded park back there! Also, it's quite nice to take the boat shuttle across the lagoon.
DS: GMR is like UoE. Nice, long, relaxing break... assuming you don't mind some aliens bothering your chill time. A fave spot of mine in Studios between RnR and ToT. It's a lot of fun to watch people on Tower while seeing the expressions of guests fresh off of RnR.
AK: This park has a lot of shade so we kind of just find a bench and sit. There's a nice resting area behind Dino, as someone mentioned. It's also fun to sit near EE to watch and listen to people buzzing about it.
I suppose I should get back to focusing on finals. Bleck. Have fun! :wave: