We are planing a trip to Costa Rica in July. We are flying into San Jose, driving to Arenal for four nights then Playa Flaminga for six nights. We are two families traveling, 4 adults and five kids (11,10,7,7,3). We can either get agency to book transfers from San JOse to Arenal and then Arenal to Playa Flamingo or rent a van the entire time. We will be staying at a condo in Playa Flamingo. Is it entirely necesary to have a car while at Playa Flamingo?