By the looks of things, we're going to be transferring this summer, which will mean a loooooong travel-vacation along with the move. "Cheap" and fun for the whole family is definitely in our plans! lol Since we'll be visiting family thru-out PA/MD (our homestates) I've been searching the web for some really good ideas:
Smithsonian Museums (in DC)
National Aquarium (in Baltimore)
Oriole & Pirates ball games
Philidelphia - Liberty Bell, Constitution Hall, etc.
Not sure if we'll get to all that, plus we'll probably add/think of more as time goes on. But I've always found that National parks and sometimes even State parks offer alot to do, and are typically free. Other places, if you look around, offer discounts, whether by coupon or just by certain days (ex: Tuesdays are half-price). Libraries also tend to offer fun activities during the summer. I know ours does family movie nights every few weeks.
"I will bless you with a future filled with hope--a future of success, not of suffering."