Teen birthday?

okay well i did this and it was so fun what if you invited how ever many people you are allowed and people could go swimming and maybe you could set up a volleyball court or soccer field and every one would enjoy at least one of the things i know you said no home spas but you could have some chairs to sun tan on and loads of snacks (guys can be huge pigs) and if you had it maybe from like 4-10 and you could like order pizza or roast hot dogs over a camp fire and later roast marshmallows and you could invite as many people as allowed to stay the night and you couldset up tents in your back yard