I don't know exactly what your tastes are but some cool ideas could be...
-go to the mall (maybe get dropped off in a limo)
-have a murder mystery party
-have a spa party and do each others nails and do facials and that stuff
-rent a room in a building and have a dance party
-have a pool party in a hotel and have a sleepover in the hotel
-have your friends play your favorite sport or have them come watch you play a game or something you have and they can root you on; then go out for Pizza or treat them at Lazar tag or something
-go Bowling
-go to Lazar tag
-go indoor skydiving
-to to an amusement park
Hope that helped :)
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Find out what their favourite music/band is and then hire a cover band or a DJ to play their favourites and a fun "dance party"! I found a great website that has a great selection of DJs and bands that you can hire for special events and birthday parties. Here's an example of a performer: bit.ly/1NlAH3S
You could plan a princess theme or somthing that has to do with barbies, Ponies, Ect.