On Shell Island, secluded doesn't necessarily mean boring. To get to the beach, visitors board a ferry which runs from St. Andrews State Park. Once there, they are treated to untouched beaches, famous diving spots, fishing and a few bike trails. While the beaches may reach capacity during Spring Break, July is a tranquility-hunter's dream. Another good bet is St. Vincent Island, which has nude and non-nude areas, a wildlife refuge and several campgrounds. Due to the remote location, beach-goers pass on St. Vincent's in July, opting for the convenience of other local beaches.
Amelia Island is a romantic Florida destination with lots of chances to stumble upon secluded beaches. Being outside of the wedding and honeymoon season, July is one of the best months to wander the island by foot, bicycle or kayak and discover the natural inlets that are lined with tawny sand.
Bon Steel is a well-kept secret, just north of Sebastien Inlet State Park. The beach is sparse of amenities, but it's an excellent example of what pre-development Florida was like. Bon Steel is almost empty in July because of the intense tides and lack of lifeguards, but it makes for a beautiful place to surf or take in some vitamin D. Another Central East option is Playalinda Beach, which goes practically untouched during July, when most visitors are kept away by the lure of popular Tampa Bay.
While the summer crowds in Tampa Bay lay their towels out on kitschy St. Petersburg beach, only a few will head to the secluded slice of sand called Ft. Desoto Dog Beach, which is just around the corner.
Haulover is the secluded part of the greater Miami Beach, although it is undeniably famous for attracting nude sun worshippers. St. Lucie Inlet isn't far away, but its secret to staying secluded is the large formation of barrier of rocks which keep in the wild nature and keep out the crowds.