Mid-March fits my sched and gives time for more to sign up. The campsites are first come-first serve unless we get enough to reserve the entire area. He said on the phone that it would take around 30 people, but I bet if we had a dozen we'd be OK.
Looking at the calendar, I see weekends available for the 10th, 17th, & 24th of March. At least one of those is going to be Spring Break. While that may work out better for some folks, and enable others to bring thier kids, we'd need to make sure we've got enough to reserve the site b/c I imagine there's going to be some competition to get one during Spring Break.