These parties are often very casual and all about the fun. Keep in mind that if alcohol is being served, the party should be held a week before the wedding just to be safe. No one needs a hung over bride and groom.
These parties often include a theme. You can also choose sporting events, comedy clubs, spas, a shopping trip, etc. Some fun things to do at a bachelor/bachelorette party include laser tag, paintball, gambling, golfing, bowling, or even camping.