The main road is called Beach Road and it is the only road until you get quite far up the Island and the road splits for the last mile or so. One side continues along the beach, the other goes past the Jupiter Island Club.
Homes on Jupiter Island are either located directly on the ocean or face the Intracoastal Waterway. A few choice parcels, like Greg Norman's house, go completely through the Island from water to water.
You can see all Jupiter Island homes for sale at Coastal Florida Real Estate. Or for personal service, call me at 561-762-4073.