A good friend of mine once had a party in a hotel.
They invited 3 people (me included) to go to Hilton Hotels.
We first went round theirs for a bit, and then went shopping (this could also be for sweets, balloons, dvds etc) and then went to the hotel.
Us kids stayed in one room while the parent/s stayed in a room right next to ours (there was a door inbetween the rooms)
We swapped presents, ate, drank, gossiped, watched movies and then eventually went to sleep. We woke up, had breakfast and went to the tennis courts/swimming pool etc.This was great fun