Best Vacation Ever:

Running away from home for three weeks in winter with one duffel bag of clothes and traveling up and down the entire state of California on trains, buses, and the odd hitchhike. Bummed places to live off of friends I had around the state. It cost me $150. (It wasn't really running away from home, as I talked to my parents often during the trip, they were just mad that I did it. (Silly parents.)

Worst Vacation(s) ever:
Almost any family vacation.