Lots of places in Le Palais rent out bicycles (about €13 per day) and motor scooters (about €49 per day).
April to September, Belle Île Bus run tours covering the coastal highlights (adult/child €15/7), stopping for around half an hour at each sight. You can take a more extensive tour for adult/child €18/9. Buses depart from Le Palais bus station, near Route de Sauzon.
Car-rental rates on the island start at about €61 per day in the high season (much cheaper during the low season), but that's cheaper than transporting your own vehicle to the island. Outlets dot the harbourfront in La Palais, but it's best to call ahead to reserve. Try Locatourisle.