When people in Guyana refer to buses, they mean minibuses. Minibuses travel throughout Guyana and are the cheapest way to travel. Minibus fares range from G$60-G$1000 US$1 = G$200 depending on the length of the journey. Travel in this mode at night could be risky.
Many parts of Guyana are separated by large rivers. These areas can be traversed by way of river taxi. Go to the port village and ask from where the speedboats launch. Ask other passengers what the fare is while traveling as boat operators tend to seek higher fees from tourists. Do not take "specials" without first negotiating the price.
Taxis are a good way to get around in Georgetown. Fares should never be more than G$500 for travel within the city and most fares should be around G$400. All taxis license plates begin with 'H.' There are set prices for taxis for different destinations, e.g. from the airport to town costs GD$5000, from the airport to Molson Creek is GD$24000, etc.
One can also rent cars or 4x4s; check the local telephone listings for car rentals. Consult more than one rental agency as prices can vary. You might also be able to negotiate the prices charged to some extent. Deposits are usually required. If renting a vehicle, be sure to inquire whether your driver's license will be acceptable. Violations of traffic laws can result in much time wasted and possible trips to the local courts.