My wife and I are going to Siem Reap in December for 3 nights. We've sorted out our visit to Angkor with an English speaking tour guide for our first full day. On the second day, we were thinking of exploring Siem Reap.
Question: Is there anything that you would recommend that we book in advance? Does it make sense to have an English speaking tour guide to explore Siem Reap? Are there any recommended half-day bike tours?