For those boxers (with children 16 & under) who will be visiting Maryland State Parks this summer, you might want to check out Park Quest. The online registration just opened today and is limited to 1000 teams. Those who join will be sent a passport and have an opportunity to complete quests at many MD State Parks. It costs $10 to register, but admission is waived at the parks where quests are available (only on the day you're there to complete the quest though). This is my first year, but I have a friend who's done it for the past two years and her family really enjoyed it.