Vice City has yachts. Yachts have yacht clubs. Trailer footage suggests at least one - probably more. Editorial-tier rather than common-tier coverage.
What's visible
Large yachts moored in arranged rows. Adjacent clubhouse-coded buildings. Private docks at residential properties. The coding is wealth - GTA V's Vespucci had a parallel.
What yacht clubs are likely to do
Story content. Heists. Photo locations. Possibly purchasable yacht properties (GTA Online had one).