Spending about two weeks every Summer at my Grandparents house in the country with two cousins of mine. The Grandparents would let us do stuff (within reason, of course) that our parents would never let us do in a thousand years. We'd be there over 4th of July and my Grandfather would get tons of fireworks and he let the three of us shoot them off on the 4th. That was a blast (no pun intended).
Also, Christmas at my Grandparents when I was a kid was a magical time. Since I'm now grown up and my Grandparents are dead, Christmas sucks. It's not what it was.