Some people will tell you that you can do all the temples of Angkor in 1 day. I disagree.
There are SO many temples at Angkor, and they're all SO big that if you try to fit them all in one day, you're bound to get very very tired and start to hate temples by the end of the day. Let's face it, that's not why you came to Siem Reap. You came because you wanted to see and *enjoy* the temples... so do that! Buy a 3 day ticket and take your time walking through some of the most magnificent temples left on the planet.
With a 3 day ticket, you'll could even take a day off in between to wonder around the streets of Siem Reap if you felt like it, to rest your feet, regain your strength and be able to resume your Lara Croft impersonation the following day.
There are also a couple of really neat temples quite far away from the main group of temples (about 1 hour by remorque-taxi) and you just wouldn't be able to get out to those if you only had one day.
So my advice is to bite the bullet and spend 3 days at the Angkor Temples. There really is a lot to see!
