Is this a good theme for my thirteenth birthday party?

i am turning 13 in october, it will be cold, i amthinking i will have a spa themed party, we would do make up, hair, foot bathes, and a movie we will put out towels and blankets and lay in front of the tv and watch a movie but b4 that we will listen to music i am having 7 girls over and having 4 spend the night is this a good plan and what other theme ideas do u have and what can i do to make the spa party better if i have it?