Anonymous wrote:What about something like the riverfront cottages at Algonkian Regional Park in Sterling. Yes, it's about 40 minutes from DC but you could take the silver line into the city from Reston.
Each family could rent a cottage (or you could save money by sharing a larger cottage). The park has a waterpark on site, public golf course, fishing, playground, etc. You could grill out, cook (each cottage has a kitchen) or go to local restaurants for meals.
We held a family reunion here a few years ago and had a great time.
https://www.novaparks.com/cabins-camping/cabins-cottages/riverfront-cottages