My problem is choosing which rides to do.
Raven, if you can ONLY choose three FP+ attractions each day, visiting one Park per day, here are my suggestions from a long time WDW vet.
I am taking into consideration you are a DL vet, and these particular experiences are all FP+ options worth your short time.
There are of course many non-FP+ options that are absolute must-dos, but i will stick with the FP+ options since that is of most concern at the moment.
Absolute must-rides/experiences with FP+ option -
Magic Kingdom -
Splash Mountain ( Stunningly better then the charming original at DL )
BIg Thunder Mtn. Railroad -OR-The Haunted Mansion ( different layout(s) from DL )
Space Mountain ( if interested in the *original* ride experience only, DLs is superior )
EPCOT -
Spaceship Earth - ( classic, mostly original dark ride in unique setting )
Test Track - ( recent refurb changed it into something worthwhile theme-wise )
Mission:Space - ( Green Team for a milder simulator experience... milder then *Star Tours*! )
Hollywood Studios -
Tower of Terror - ( superior version compared to DCAs )
The Great Movie Ride - (Huge dark ride/live interaction element showcase)
Rock n Rollercoaster - ( if you do coasters, worth experiencing )
Animal Kingdom -
Expedition Everest - ( beautifully themed queue, unique coaster experience )
Kilimanjaro Safaris - ( unique to AK, and a fun experience )
Festival of The Lion King - ( not 100% if this is a FP+ option...but a must-see regardless! )