Sweet Sixteen Ideas?

My sixteenth birthday will be in April, and I want to have a pretty big co -ed party--about 50 people. I don`t really want a theme or planned games, but I need ideas of what else to do. I`m planning on having it in my backyard and basement, because we have a trampoline, pool table, darts, and such. Basically we`d hang out, have a cookout, and play loud music. Is this a good idea? Do you have any more suggestions as to what we can do? Thanks in advance.