Exploring Phnom Kulen (literally Mountain of the Lychees) is a gorgeous day out. The main attraction is the waterfalls at the top of Kulen Mountain and it’s also a great picnic spot; well set up in Cambodian style with hammocks and shelters to keep you shaded from the sun. It’s around 1.5-2 hours’ drive from Siem Reap and if you go all the way to the top by van or car, you need to get there early, as the road is one-way traffic only.