We are also staying just one night. We are getting there very late, but we called and they said we can use the pool until about 4 pm, when they said the next day wrist bands change. The only thing I don't know if we could do are the shows at 5pm. There are Dora Live on stage shows throughout the day, the reason we are going. Also the character breakfast (make reservations ahead of time). Last year we also stayed just one night, but we had to leave by 1pm, it was a little rushed, and we didn't get to dothe Dora live or Mass Slime.
Have fun