Start with the thing that derails half the beach plans made for this city: the beaches are mostly not in Miami. Miami and Miami Beach are two separate municipalities on opposite sides of Biscayne Bay, joined by the MacArthur, Julia Tuttle and Venetian causeways, and the long Atlantic strand in every photograph belongs to Miami Beach and the barrier-island towns north of it: Surfside, Bal Harbour, Sunny Isles. The City of Miami's own waterfront is bay, not ocean. Its swimming is out on Key Biscayne and Virginia Key across the Rickenbacker Causeway, and at Matheson Hammock below Coral Gables. Which side of the bay you stand on decides your drive, your parking bill and whether the water in front of you is clear Atlantic or green bay.
The barrier island itself divides into three stretches that behave very differently. South Beach runs from the tip at South Pointe up to roughly 23rd Street: the widest, loudest, most rebuilt sand in Florida, with the Art Deco district a block inland and the highest concentration of people per square metre anywhere on this coast. Mid-Beach, roughly 24th to 63rd, is where the enormous 1950s resorts sit and where the crowd thins noticeably; the Beachwalk, a continuous paved path, runs behind the dune line and is the best free thing on the island. North Beach, above 63rd, is residential, Latin American in its weekend crowd, shaded by Australian pines at North Shore Open Space Park, and quiet in a way South Beach has not been in forty years. Keep going and you reach Haulover, then Sunny Isles under its wall of new towers.
Across the bay, Key Biscayne is the other choice, and it is a genuinely different day. The Rickenbacker Causeway is tolled, currently $3.25 by SunPass transponder and more by plate, with cash not accepted for years, and it lands you first on Virginia Key and then on the key itself. Crandon Park has a shallow, sheltered shelf that is the calmest ocean swimming close to the city. Bill Baggs Cape Florida State Park at the southern tip has the Cape Florida Light, rebuilt in 1846 and the oldest standing structure in Miami-Dade County, plus a beach that looks south across open water toward Stiltsville and Biscayne National Park. Neither has a nightclub, and on a Tuesday in February both can feel close to empty.
Two practical truths apply everywhere. First: the sand is free, the parking is not. Florida beaches below the high-water line are public, every one of them, including the sand in front of the Bal Harbour condominium towers. What you pay for is a space to leave the car, and in South Beach that is metered kerbside at the top of the scale or a municipal garage, while county parks like Haulover and Crandon charge a flat per-vehicle rate that is far better value for a full day. Second: sargassum. The floating brown seaweed that has plagued the Atlantic basin since 2011 lands here roughly April through August, peaks in May and June, and 2026 has been a heavy year. It is harmless, it smells strongly as it rots, and crews clear the main tourist stretches first — which is one of the few arguments for South Beach over a quiet park in early summer.
Then the flags, which people ignore and should not. Lifeguard towers fly a colour system: green for calm, yellow for moderate surf or current, red for high hazard, double red for closed water, and purple for dangerous marine life. Purple in Miami usually means Portuguese man o' war, blown in on winter and spring easterlies, and the sting is genuinely painful. Rip currents here are most common on windy days at the inlets, particularly either side of Haulover Cut and Government Cut, where the tide moves hard through a narrow gap.
