Official 'tourist buses' are government operated, but there are many tourist coaches which is serving tourists only. In peak season, it is best to book a couple of days in advance. Vehicle Hire Car rental usually comes with a driver and is widely available in Kathmandu. Note that formally renting a vehicle can be relatively expensive, though rates are usually quite negotiable. There are many bicycle hire places in Kathmandu and Pokhara where you can hire anything from a good mountain bike to heavy, old, rusty specimens.
Cycling is undoubtedly one of the best ways of exploring the city and countryside.
Kathmandu and Pokhara are the only places where you can find a selection of motorcycle hire places. Make sure that your travel insurance covers you for motorcycling. The auto-rickshaw is found all major Terai towns. You can hire them as you would a taxi. They are a good way of getting around town.