My daughter will be 13 in December. Here is what we have done for the last 2 years and it was a hit.
Last year for age 12. We rented a suite at the Marriott at Shops of Legacy. Total of 5 girls. I had one room and joined with their room. They swam, we went to dinner at Nicola's, had room service late at night with ice cream, breakfast in the am and they all got picke dup at 10am. Now, my daughter's bday is 12/27 so things are not very busy and hectic at the hotels, etc. The Shops of Legacy is a nice place to stroll and all as well. They loved it. Treat bags were a $20 Abercrombie and Fitch card. I think we spent less than $500
At 11, rented a limo. Limo went to each girl's house personally to pick her up. Total of 9 girls (limo will only hold so many so you limit the # of girls). They had a blast listening to their music, having the sodas, etc in the limo, driving all around and when it stopped they would put their heads out the sunroof and had dinner. When it was done, they came to our house, had sleepover. Spent less than $500 Treat bag was a cutsie bag filled with girly girl stuff (appx $20 each)
NOTE: if you are a frequent flyer/traveler, cash in the miles for the hotel room.
We did the limo thing twice because it was so popular. She is thinking about doing the limo again this year and go to salon to have manicures and pedicures and then to another hotel. If you stay at a hotel....your house doesn't get messed up!!! OR, have a catered buffet dinner at a fancy place and then hotel.
A party she attended and enjoyed this summer was.........a sleepover where the girls had hair professionally done, professional pictures made, dinner and then to see the movie Hairspray. The treat bag was a mini album with a few of the pictures and a disc with all of the pictures.
I hope some of this helps! I am in the midst of planning 13 too!