Are there any recommended places to visit outside the outer ring of Angkor Wat ?

The Angkor National Museum, the Apsara Dance Show in Angkor, the bamboo train in Battambang, Pub Street, Night Market, the beaches in Sihanoukville, and so on.

Advice 1: First outer circle, then large circle, and finally small circle (reason: first see the general, and then see the essence, otherwise you will regret running for 3 days).