Visit Maximo Marina at 4801 37th Street South in St. Petersburg, Florida. Maximo Marina is the largest covered marina on the Florida Gulf coast and offers 220 wet slips and high and dryáin a protected harbor with easy gulf and inter-coastal access.á This full service marina has certified technicians on staff for repairs and maintenance and offers gas and diesel fuel. Maximo Marina offers direct passageway to the Johns Pass/Gulf Mexico.