My group loves to eat at TRex. I don't think there is another anywhere else to visit so it is a must! As far as boat rides, I know Saratoga Springs resort is a boat ride across from Downtown DIsney and that isn't one that I would make a special trip to. Your plans of Quest, balloon ride, and a meal would be a whole days worth with my family. Quest is phenomenal and you will easily spend 4 hours or more there enjoying it (my gamer of 13 MUST visit each trip to Orlando). I believe it opens at 11am so you have time to walk around the shops and could eat lunch before going in. One more mention: Bibbity Bobbity Boutique is there too - any interest with daughter? My 15 year old daughter is excitedly planning a trip with her 5 yr old cousin - they service customers of all ages. Have fun!