18' Century CC: Day-Boat Rental from Grassy Key Marina in Marathon, FL

On a clear morning in the middle Keys, the 18' Century CC waits at Grassy Key Marina, where Marathon, Florida meets the Gulf and Atlantic in a braid of shallow flats, mangrove islets, and the near-shore coral reef. This compact center-console boat, powered by a Yamaha 115 four-stroke, is built for confident day trips across glassy bays and through narrow channels toward fishing grounds, snorkel sites, or a quiet sandbar. Rentals run from single-day outings to multi-day stretches; check-in is at Grassy Key Marina (59073 Overseas Hwy, Marathon, FL 33050, USA) and guests should arrive fifteen minutes early with a photo ID. If you were born after January 1, 1988, bring your Boater Safety Certificate. Minimum renter age is 21 and the boat accommodates up to six people.

The scenery around Marathon is straightforward and singular: miles of seagrass flats, mangrove shorelines, occasional limestone outcrops, and the offshore Florida Reef — the only living barrier reef in the continental United States. Look for nurse sharks gliding over sand, green sea turtles grazing on seagrass, and schools of snapper and tarpon near bridges. The boat’s shallow draft and responsive engine make it easy to explore sandbars and backcountry cuts that larger vessels can’t reach. Note: towing activities—tubes, wakeboards, waterskis—are prohibited by insurance rules; plan on cruising, fishing, or snorkeling instead.

This rental is practical for anglers chasing permit and bonefish on the flats, families seeking a nimble vessel for a day at a sandbar, or divers running a short shuttle to reef sites. The Century’s bimini provides sun cover between stops, and the 115-horsepower motor balances fuel efficiency and reliable power for offshore drifts or cross-channel hops.

Local color: Marathon grew from fishing and turtle-harvesting communities into a hub for conservation and reef restoration; the Seven Mile Bridge and the Overseas Highway frame much of the region’s access and history. Respect for fragile seagrass beds and coral is essential: use marked channels, avoid anchoring on reef, and bring reusable gear to reduce plastics.

Practical tips before you go—pack reef-safe sunscreen, a small first-aid kit, plenty of water, and a dry bag for electronics. If you’re planning to fish, file a trip plan with shore contacts and check local regulations. For a short slice of classic Keys boating—easy to pilot, geared for day trips, and based in Marathon—the 18' Century CC at Grassy Key Marina is an efficient way to get on the water and into the marine scenes that define the Middle Keys. Bookings are available by the day or longer through the operator’s online reservation; confirm fuel policy and any extra equipment like life jackets or GPS before departure. Expect calm mornings and breezier afternoons—plan accordingly. Bring binoculars too.