Hiring a mountain bike from one of the several hire shops in Thamel or Basantapur ( off Durbar Square ) is inexpensive and enables day or half day trips to worthwhile objectives on the outskirts of Kathmandu:-
1) Budhanilkantha - statue of the "Sleeping Vishnu" on his bed of snakes. ( 1/2 day )
2) Temple of Bajrajagoni at Sankhu.
Can also visit the Changunarayan temple and Gokarna country park on route. ( 1 day )
3) Medieval city of Bhaktapur ( 1 day )
4) Daxinkali - sacrificial temple for chickens and goats on Tuesdays and Saturdays.
The temple at Chobhar Gorge can be visited on route. ( 1 day )