Treasure Coast here. That's Martin & St. Lucie Counties... about 2- 2.5 hour drive north of Miami. Yeah, it's pretty flat. We have two causeway bridges together in Stuart and one in Jensen Beach (about 3 miles north of Stuart). I've done many a Saturday morning bridge repeats of between 25-35 bridges. And the elevation gain is never what I thought it should be. When training for 6 Gap three or four years ago, I'd drive 2.5 hours up to Clermont to do hill repeats. I have an 11-mile there and back route that provides 1,100ft of elevation which includes Sugarloaf Mountain Rd. When doing it, I get 3-5 repeats depending on how early I wake up, how in shape I am and how hot it is. I need to get off the bike by 10:30 AM in the summer in central Florida. It's hotter than those of us on the coast and there's no wind at all.
For those of you who want to extend their event schedule beyond the fall, come join us here in Florida for the Horrible Hundred. It's usually just before Thanksgiving and has 4,800feet of climbing over the century ride. That may not seem much for many of you, but I've talked to some of you "Northerners" who were surprised how challenging it was.