[LHaven]

The "destination park" is definitely a special case. If your trips mostly involve a one- or two-day drive to a place where you're going to stay a week or two, there's little advantage to planning on the fly. When you're taking 10-14 days to travel cross-country so you can stay somewhere for a visit or a function, planning on the fly can be real valuable. I don't even try to predict when I'm going to "arrive" at the far end of a trip like that, because there are too many opportunities for delay (health, breakdowns, whatever).