Yep, my fam did this once. It's really up to you. Do you have any Park Hopper days? That would make your trip even more fun.
My family took a trip to Disney's Vero Beach resort and to top it off we thought we'd spend a day in DW. We had Hopper days left over from last trip, but we knew we'd only be there for one day. Since we go often, we already knew what rides a DW vacation wasn't complete without, so early in the morning, it was off to the races!
We just went from park to park rapid fire. Jogging lightly between rides. It was hysterical! My family is pretty adventurous (my dad only just passed his 39th birthday this week and my mom is only 38--both run marathons regularly, so even they have plenty of energy to burn off) so we're really into the thrill rides. We nailed all the mountains, RnR, ToT, Dinosaur (Countdown to Extinction back then), we didn't go to Epcot because at that time there literally was no thrills at Epcot. I'm glad that's changed. I know you can't please everyone, but with any theme park I think you have to at least try.
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"I will now raise the price of park admission to One MILLION DOLLARS! MUAH HA HA HA HA HA HA!" --Dr. Eisner :drevil: