You can rent bikes, but they all seem kind of 1960 to me, at least the ones I've seen, but if you are strong, go for it. Also nice is to have a good pair of reef walkers and head North along the beach. I've walked up to Capricorn, and back, and could have gone further. Enroute, good food at Sweet Basil or at Capricorn. Going South, you can walk a long way before you even need reef walkers. You can also rent a gold cart and go a long way if you want to see the tips of the caye.