It is common practice when you need a bus for an tour itinerary you created themself. Many people go on such trips, because travel agencies in most cases offer a trivial program with a visit to places where there are many of the same tour groups. You just need to choose
event transport services that can provide you with a bus with the necessary number of seats and where you set your itinerary. There are many such companies, you should choose according to your budget and the level of comfort you want. For some people the presence of a toilet in the bus is a must, some will be satisfied with a bus which has wheels, roughly speaking. For me, for example, it is important that the driver knows English, so that if something happens, you can discuss with him the details of the trip without using translators.