I am 13 years old and i am having a birthday party in a few days. i have no idea on what to do at the party...?

I live in the country so I have alot of space. last year we had manicures and pedicures and a giant slip and slid. I have a pool but I don't know if it is going to be clean by my party. I want my party to be different than it was last year because I am inviting some of the same people... please help me!