The kids gathered at Adventure Rock (21250 Capitol Dr., Pewaukee) for a birthday party pay no heed to presents or cake. Instead, they’re watching a friendly worker teach them about the gym’s 17 auto-belay ropes. The gadgets make safe solo rock climbing a breeze on routes as high as 35 feet. Many more traditional belay stations and two bouldering caves ensure lots of variety. Even if you’ve outgrown birthday parties.