Fun, yet not expensive, Sweet Sixteen entertainment ideas?

Why not try devising a treasure hunt around your yard/garden/house, your could have a fun prize at the end or, for something different why not make the 'prize' a fore-fit that could be fun, or you could have video game competitions (knock out rounds etc.) the other thing is have a Karaoke always good fun. Most important enjoy yourself and have a great 16th.