My sons 7th birthday was in August.  We decided to have a super-soaker birthday party.  I purchased super-soakers for all the children that were attending the party.(The super-soaker was also apart of their goodie bags.) All the kids brought towels and came with their swimsuits on.  We had a large kids swimming pool set up in the yard for refills on their soakers.  They were told a few simple rules and then off they went.  Let me tell you, they had a blast squirting each other and getting soaked.  Dad and my sons uncle had to join in on the fun, but they had the extra large super-soakers.  It was the kids against dad and uncle. I heard kids comment on how this was the best party. There was no time limit, just plain old fun. (Luckily we had a hot, partly sunny day when rain was in the forecast.)  We served cake and opened the presents, this was a great time to dry off before the party was over. This party was the easiest party to plan and one of the least expensive. I also had no mess to clean up since it was only water that needed to be dried up. The goodie bags were simple, they got to keep their super-soaker, water squishy balls and some candy.   Oh, the kids swimming pool I mentioned for refills, the kids all ended up in the pool towards the end of the party.  Overall, this was one of our best parties.  I plan on doing it again next year!