There is no road here. This is a protected area, listed by UNESCO in 2005 as the Islands and Protected Areas of the Gulf of California, and its coastline is mostly empty cliff, cactus and sand. The ride attached to it is really a ride to the edge of it, and it makes sense to be clear about that.
Tiburón belongs, in a cultural sense, to the Seri people, the Comcaac, who have lived along this coast for centuries as fishers, hunters and gatherers, and whose territory faces the island across a narrow channel. Their basketry, woven from desert plants, and their carved ironwood animals are known well beyond the region. The island itself holds mule deer and a population of bighorn sheep, and its shores attract sea lions, pelicans and frigatebirds.
The sea around is the real wonder. The Gulf is rich in nutrients, and whales come to feed, including fin and blue whales and sometimes grey whales in the cooler months. Dolphins ride the bow waves of fishing boats. The water is warm, clear and green, and the desert comes right down to the shore, so you see saguaro cactus standing within sight of surf.
For a rider, the useful places lie on the mainland. Bahía de Kino, on the Sonora coast, sits in front of Tiburón and is reached by a long straight road from Hermosillo through desert flats and mesquite; the surface is usually decent, but the heat in summer can be extreme, and you should carry plenty of water and avoid the midday hours. Fuel is available in towns along the way, but stations can be far apart in remote stretches, so fill up whenever you can. Boat trips depend on permits and local operators, and some areas of the islands are off limits, so ask in town and respect the rules. Winter and spring are the kindest seasons here.