Bokor Hill Station
32 kilometers and 1,101 meters up from road 3 near Kampot, is the Bokor Mountain Hill Station, in Bokor National Park. Originally a small resort town, it is now an abandoned ghost town and National Park. Except for the many tourist and Park personnel, and a few hundred construction workers and a casino / hotel, that is. Most famous for the abandoned Casino at the top of the mountain, there is also a church, buildings for the former king, and either a view of fog or a view of Southern Cambodia's Islands and Vietnam's island Phu Quoc.
There are stories of wild animals on the mountain, including lions and tigers and bears, and elephants, but if you actually see them, please let us know.
Getting up to Bokor National Park
From Kampot, take the road towards route 4 about 8 kilometers. On the right side, you will see a large plaque welcoming you to Bokor National Park. Just up the road is the Bokor ranger station. There is a 50 cent fee for motorcycles and $1 for cars to go up the mountain.
You can take a motorcycle or car up to the top. If you don't have your own bike, big dirt bikes can be rented in Kampot for less than $12/day and 100cc motos for $4 - $5. Gas is 80 cents a liter. The drive up is now smooth and quite nice. You may want to bring some warm clothes and a raincoat, as the temperatures, especially at night are much cooler, and there is often fog or rain at the top.
You can also get a ride in a pickup truck (either inside or in the back) for a day trip, including lunch for $13 to $25. Most tours leave from downtown Kampot.
Walking is sometimes an option, but plan for a few day trip, with lots of gear. You'll need to check at the ranger station at the bottom of the mountain, to see if they'll let you walk. You can hire the rangers to give you a tour, and the price is whatever they can charge. $10+ per day. There are walking trails on top from a couple hour walk to a full day.
There are some sights to see on the way up, such as the waterfalls, and the old King's "staff" accommodations, so you might want to take a few rest breaks along the way. You should also bring something to eat and drink, which is really helpful if your vehicle breaks down. The road is about a 30 minute ride from bottom to top.
Most people stay in hotels in Kampot, Cambodia, and take the day tour up the mountain. That's changing quite a bit now, with the new Resort at the top. You can also take the trip from Kep, Cambodia, but it's about 50 minutes more travel time, round trip.