The ancient city of Angkor just outside of Siem Reap is completely magical. You could spend weeks riding bikes or taking tuk-tuk around the tree lined roads viewing all of the temples in Siem Reap. With the occasional stop to take a picture of a group of monkeys or to buy a coconut the size of your head - it is a trip you will never forget.
Even after 2 full-days of temple trekking we did not see all of them, but got a great feeling for the different styles and types of temples throughout the different time periods.
We saw over 20 temples (which was probably our limit) and wanted to give you our Top 5 in case you are only there for a short period of time.
1) Angkor Wat 2) Ta Prohm 3) Bayon 4) Neak Pean 5) Bantaey Srei
Check out the link for a more detailed description of each.