Friends have stayed at Destin West RV Park and we have driven through checking it out while staying at Camping on the Gulf, just east of Destin. It's a nice, newer RV Resort.
As already stated, the gulf beaches in this part of Florida are amazing. Destin has quite a bit to do for families. From the historic things mentioned like the forts, NAS and state parks (Topsail Hill is great, but hard to get a summer reservation) to typical tourist things like mini golf, go carts, shopping, the harbor area with shops, fishing charters, jet ski rentals, dolphin cruises and para sailing. Plenty to keep a family busy for a long time.
Destin West RV is actually closer to Ft Walton Beach and Okaloosa Island. A few miles away from the crowds of Destin proper. Destin West also isn't on the beach, but north of the main highway backing up to the inner coastal waterway. Very nice, newer RV 'Resort'. It isn't State Park camping. We were through a few years ago, it was still fairly new and had a nice parking lot sort of feel. It does have some grass behind and next to most sites. Pics on the web still show it lacking many trees.
Has great ratings on the web.
2016 Coachmen Chaparral 390QSMB
2011 F350- CC, DRW, LB, PSD
2016 nights camped: 40