Hotel Birthday Party! -Help ASAP?!

Hey guys, well i'm having my 13th B-day party with 4 other girls so they're will be 5 all together. (At the hotel) And my parents are in another room, ect. So i'm looking for some hilarious pranks -that won't cause damage but make it memorable. Any suggestions really help. BTW the old ones like, shaving/whipped cream on hand tickle there nose ect. Lame! I already know them. So all you pranksters, PLEASE suggest a couple! Thank you !