They should be in possession of valid return tickets. All authorised car rental companies can issue you a drivers license if you have a valid license. Worthing Holetown Check out the Hastings link to see a location map. Others will be added. Most of the hotels, restaurants and commercial establishments will accept credit cards.
Travelers cheques in U.S., U.K. and Canadian funds are also cacheable at many outlets.
Most have ABM that will accept credit cards and Interac.