Key Biscayne About 5 miles or so Southeast of Miami, Key Biscayne, Florida is just a causeway away from the hustle and bustle of downtown Miami. It’s a cosmopolitan community in a world of its own. The city has established a park, planted palm trees and flowers, and keeps the sand beaches fresh. The island in Biscayne Bay is a year-round playground for visitors from all over the world. Enjoy world-class sailing, fishing, golf, tennis, the beaches, the historic lighthouse, hiking trails off the beaten path for nature lovers, more accessible paths for joggers, bikers and in-line skaters. There are picnic areas, casual outdoor dining and fine dining restaurants plus unique shops, boutiques, and art galleries.