-KEYS COLLECTION: Margaritas building, Paseo Mediterrano, s/n. Miami Platja. Phone: 977 811458. Open monday to saturday; 09,30 to 13,30 and 16,00 to 20,00. Sundays and holidays; (from 15june until 15sept) 10,00 to 13,00. DEPOSIT: 50?/person. The apartments are about 75 metres from the beach, with a lift and each block has its own swimming pool. Close-by is a supermarket, bar-restaurant, public tel