Jacksonville here. Love it here. One of the largest cities by land area in the world. Largest parks system in the country. Plenty of hikes, beaches, rivers, tall buildings and things to do. Downtown needs some help, but it's in progress. There is crime in some places, but it's small pockets for the most part. We live in one of the older little areas close to downtown and a block from the St. Johns and we love every bit of it. Quiet neighborhood, beautiful old homes.
It has Florida weather with the southern charm missing from most other Florida cities. There are no other places in the state where you can get the true beach feel (both the more urban beach and TONS of secluded beaches) and the river feel. All of the photos I took in that thread last night were from one day in and around the Jacksonville area. Tons of history, tons of kind people, a massive city with a small town feel.