I don't know anything about Naples area. I am 1.5 hours North of Naples working at a large non-profit hospital. We used to see seasonal change in census but not as much any more here. I think tourism picked up and it is common to have patients who were visiting end up on our unit. The last two years our lowest census number was what our highest census used to be 2 years ago. Both last summer and this summer I ended up working overtime. First, a lot of staff wants to take time off in the summer because their kids are out of school. Our unit even had a calendar with blocks when nobody else could request vacation because so many already had time approved.
I think it depends on the type of unit you end up working. I work on a cardiac/telemetry unit. While we were busy, our ortho unit was flexing staff because most of their patients undergo elective surgeries. Our county is the oldest county for its size in the country, so the peds unit constantly has low census, etc. You get the idea. Plus during the high season, we were so full that we had to open overflow units and hospital paid double rates and high census bonus program to get staff to come in. So, you could save up a nice cushion for the slow time. And last year we were so busy during the summer that staff annual bonus was doubled. I have not heard anything about this year yet. But we were busy most of the time. and by busy I mean full.
I would try to talk to the nurses who actually work in that hospital system.