Keep and Sihanoukville are visitor friendly beach towns to visit. They have a great collection of hotels, activities and the scenery can be quite beautiful.
Obviously Siem Reap with Angkor Wat is a must do, the night markets, artisans d'Angkor and floating villages on the Tonle Sap lake are worth a visit too.
If you have the time visit the north, near Ratanakiri, there are some national parks to see, they're a bit further out of the way though.
Within Phnom Penh the Royal Palace, Wat Phnom, riverside precinct with restaurants, Tuol Seng prison and killing fields are a little less light hearted but thoroughly insightful and worth a days visit. There a lot of NGO run cafés worth a visit too, they sell locally made stock which is well worth buying to support them. Market wise the New market ("Psar Thmey"), russian market and orussey market are all worth a visit. Nearby the Psar Thmey is the Sorya shopping centre which is also quite good, sells a lot of goods and is the closest to a western shopping centre I've seen in Cambodia.
Hope that helps! over 4 years agoAnswered by Tristan via WorldNomads.com