I fish out of St Lucie inlet and we catch sailfish just about year round here. Some of the best numbers of fish are caught in December and during the summer months. I don't know of any campgrounds located near the coast. You'd probably be better off checking
www.vrbo.com for a rental for the period you'd like to stay. You can also post on the southeast general section of the Florida sportsman fishing forum for additional info. Hope this helps, Jim Serra, Palm City