are you having it toward night (ex 6-8 or 7-10) or in the afternoon? if you are having it toward night, it is cool to have several different activities and let the people deide what they want to do. You can have a movie playin inside, a bonfire out side (if there is enough room) a volley ball net set up, and some music playin, dont forget a whole lot of junk food. Some people will choose to watch the movie, some play volleyball, others will just hangout and eat and chat and dance. The key is to make sure you hang out with all of them for at least a lil bit b/c ur job as the hoste or hostess is to make sure they are having a decent time.