We have our Kids Camps out at Meadoemere Park on Lake Grapevine all summer for ages 4-13 and have a 40x40 pavillion tent we put up. We also have archery, target shooting, kayaking, fishing and more. www.AdventureDayCamps.com
We could host a birthday party for your son, then one for your husband and father. We could grill hamburgers and hot dogs, etc. We have some fun teambuilding games we use with kids and adults that would be fun for your dad's/husband's party. Something for everyone and you could "enjoy" the day without having to worry about the planning and activities :-)
I can be reached at ###-###-#### if you are interested.