1. West Michigan
2. Florida, Texas, Arizona
3. Just after Thanksgiving until mid or late April
4. Four years -- We have done Florida twice and Arizona (and other "out west" locations) twice -- headed to Texas, Arizona, California, and Nevada in 2018-2019. Prefer the SW states by far--amazing hiking and sights.
5. We sometimes hook up with friends along the way, but find we like our independence to go and do what we want to do more. Typically, we move around about every week or two. We also enjoy the trip out and back as much as the time we spend at the destination. The trip home can take 3 to 4 weeks. Ah, retirement rocks!
6. Thinking of becoming reverse snowbirds--finding a warm and sunny late fall/winter/early spring base and traveling the remainder of the year.