Private tourist vehicle or a tour bus (both from Tourism department and Private operators), cars arranged by hotels / resorts, group tours arrangement, etc. all of these I guess are common across all major tourism destinations.. Goa is no exception. But what makes Goa different is, availability of almost all types of self driven two and four wheeler vehicles easily on rent. I can say almost all shops in a tourist area say Baga Calangute in North Goa, can provide you with a rented vehicle. You can negotiate a bit and check the condition of the vehicle, deposit an id card and the amount..you are good to ride. There are autos as well for short rides and some government local buses also plying in between places but not very frequent. One private app cab backed by the Government also operating but it gets some resistance time to time from local taxi unions.