16th Birthday Party Ideas !?!

kay so , me and my 2 bestfriends are turning 16 in the next few months... we need ideas of what to do, we want to have a huge posible... but we cant beacuse there will be underage drinking... and our houses are right on the high way there for we are unabke to have it at our houses. . we were looking for any cool ideas, or sugestions on where we could have it... PS We live in the country...