We rented two bikes from the internet cafe next door to our guesthouse for $1Usd/bike/day. We started our bike trip to Angkor Wat, about 6kms North of Siem Reap. About half-way down the road was the main ticket booth where day passes to the temples were being sold. 3+ day passes require a photo which they take and laminate with the passes. There were staff checking for tickets at the temples, and if you failed to show yours, there would be a $30Usd fine.