We didn't do that much at my parents... it's the reason we go there... the ability to lay around the house all day and not feel one bit guilty about it. Yes, we like that.
We did get out one day and took the kids to Hershey's Chocolate World. I have no pictures. It is just about THAT awesome. It's a pseudo-tour through Hershey's Fake Chocolate Factory. It smells good and it's a nice opportunity to sit down. You get free chocolate at the end. Meh. It was fine. I'm sure the kids enjoyed it. I know that I did as a child.
The only other thing we did as a family while at my parents' house was take the kids to the BEST PARK EVER. First, you must understand. It was HOT. My parents do not have central air conditioning. Hence, the need for some water fun.