I think Angkor Wat 2 days may not be enough. There is Angkor Wat itself, then Angkor Thom, Bayon, Ta Prohm, Banteay Srei, Beng Melea and Preah Vihear temples. For non-temple, there are the river tours Kampong Phluk and Kampong Kleang. If interested in nature, Phnom Kulen has some interesting...