Senior couple looking to spend about a week in the Florida Keys next winter.... No need for golf, swimming, or sunning at the beach, but we do like to see the natural beauty, visit nature preserves, museums, maybe even try fishing, etc. My thinking is to split the week between Key West, of course, and somewhere further up the Keys?? Does that make sense and if so, can you suggest the second place that we can base ourselves for a few days? Thanks.

Marathon?