I need help planning my first coed party!?

so i asked my mom the other day if i could have an end of the year party and have it be coed and she said yes but i need advice on how to get her to allow me to have as maany kids as possible. im 13 and its my first party going to or having so i wanna make it AWESOME. i need advice on cool activities. i have a pool and i wannna have it be a pool party butidk if kids r gonna be to self conciuos to swim. also i wanna play manhunt. any other suggestion. oooo and from 5 to 10 on the last day of skoool. i need imput so anything will help. thnx. =)