The streets are not to good in Roatan, but is nice to drive arround to see the beauties of the Island.. Renting a car for one day is enought for a good tour.
We rent one at Sandy Bay... i'm not too sure but was arround 50 dlls for 24 hours.
Taxi service is readily available. Be sure to confirm the price to your destination prior to taking the trip. Taxi rates are supposed to be fixed by Mayoral Order from the ship terminal on the east side of Coxen Hole to major tourist locations on the island. There is regular bus and van service for French Harbour and Oakridge, as well as Sandy Bay and West End.
Water taxis are cheap and fun option, but you have to wait for a while in the dock to be pick up....