Oleta River State Park, the largest urban park in the state of Florida, offers the most picturesque of settings for lunch. The informal Blue Marlin Fish House is located where the original Blue Marlin Smoke House stood in 1938. It was a trading post back then, a place where people could anchor their boats and barter their catch. Now the grounds boast a nature center that details this history, a smoke house, and a breezy eating area with a view of the Oleta River rolling by. The menu is mostly composed, perhaps to no great surprise, of smoked fish specialties straight from that smoke house. Blue marlin, salmon, and mahi-mahi are the primary smokees, and can be sampled together in a tasting plate ($8.95); as sandwiches or wraps ($7.45 to $7.95); atop salad with walnuts, grapes, and creamy tarragon dressing ($10.95); or as entrées with rice or pasta ($12.95). Burgers, hot dogs, pizza, and other nonsmoked kiddie-fare is available, too. After lunch, you can walk a few yards, rent a kayak, and float away.