The Derelict Lighthouse and the Hungry Sharks

You’re shipwrecked on a little island. An island so small you can see across it from one end to the other. Just enough land for you to feel you won’t drown at high tide. The only man made structure on the island is a decrepit lighthouse. Obviously it’s been abandoned for some time. Luckily you have your digital camera so you spend your first hour or so taking really interesting and artsy photos of the derelict lighthouse. Now, how do you get them off the island, onto your home computer? Can you rig up something with whatever resources are on the island or will you just try to swim home, see if you can out race the hungry sharks?