ACA puts you on highway 90 in north Florida. In its full extent, 90 runs between Jacksonville, FL and Van Horn , Texas. There are three main possible routes through north Florida, each with its own positive and negative values as far as cycling is the matter.
90 has many motels and campgrounds and wooded areas for free camping. The many trees help fend the north winds of winter. Restaurants abound. The scenery is good. You have a side lane to yourself most of the way. It is historical. There is the used-to-be infamously cruel Chatahoochie mental hospital. There is the even worse state training school in Marianna, FL where forensic anthropologists have unearthed 91 of the 31 bodies of boys the state said were there. Yes, 91. Seems many just disappeared, probably beat to death. 90 is also very hilly.
There is highway 20 running E and W many miles south of 90. 20 is much closer to level than 90, and thus faster and easier to cycle. There are many places for free camping. Traffic is comparative light. There is plenty of room for safe cycling. However, 20 can be a nutritional nightmare. Once west of Wakulla Station, only one store or two have anything resembling real food. You have three days of mainly junk food.
There is 19 / 98 running along the contour of the gulf coast. This road is about level. There are many places for camping, legally and stealthily. Restaurants are aplenty. Food stores with nutritious food are available often enough. The downside is sea breezes off the gulf are not always just breezes and they can slow you to a crawl. This route is about 60 miles longer than 90 and 20.
All in all, there is a good argument for choosing 90 as the best of the three.