Just checking in tonight as I haven't been on the DIS for a couple of days...Thanks for the opinions about MI campgrounds. We've considered both Luddington and Hoffmaster before, and it's nice to know they are both nice, and not too far from us also.
Not so Dumbo, we have driven from Holland, MI for the past 3 trips. There are 4 of us (last time 5, as we had my MIL with us too), and we take 2 full days to drive each way. On the way down, we drive the longest leg first, to north GA, then have about an 8 hour drive the second day. On the way home, we stop in Tennessee, around Nashville. We've debated about flying, but decided that between the cost of plane tickets, airport parking, and rental car we come out a bit ahead. DH also prefers to have our own car in FL. We like to take longer trips too, so far up to 14 days, so we stay in a condo and bring some food too. And we enjoy the drive...for the most part.

If we decided to take a shorter trip, say a week or less, we would definitely consider flying, however.