Can you suggest ideas for a father-son vacation in March?

I think we could either go warm or go cold, but not that nasty time that usually happens in March. I think we’d like to do some adventuresome things like bicycling, hiking, swimming, snorkling. It would be nice to have some historic stuff going on. Beautiful architecture would be nice.

It can’t be luxury, but it doesn’t have to be economy either. If the plane ride is less than $500, it could be anywhere from Baja to Banff; Costa Rica to South Carolina.

If there are activities with other ten year old kids, that would be good, but not necessary. No Disneyland stuff. No theme parks. Resorts might be considered.