Breakfast at the hotel. Free at leisure if for today. You can book an optional tour to visit the Terrace of the Elephants, Leper King, Former Royal Palace, Baphun, Pra Pithu, North & South Khleang temples, and visit Tonle Sap Great Lake and take boat trip to see the floating village would be a great recommended. Overnight at the hotel in Siem Reap.
Day 6: Siem Reap - Battambang (B)
After breakfast at local restaurant depart to Battambang by private A/C transport. Its an amazing countryside view from there. Overnight in Battambang.
Day 7: Siem Reap - Phnom Penh (B)
After breakfast at local restaurant, early morning departure from Siem Reap to Phnom Penh by joined bus. After arrival in Phnom Penh private transfer to your hotel for overnight.

Day 8: Phnom Phen - Kampot (B)
Departure to Kampot Province by joined bus. Overnight at the hotel in Kampot.

Day 9: Kampot. (B)
Breakfast at the hotel. Free at leisure to explore the nature and local communities by bicycle or boat. Overnight at the hotel in Kampot .

Day 10: Kampot - Sihanoukville (B)
After breakfast at the hotel, private tranfer to Sihanoukville. On arrival check in the hotel for overnight.

Day 11: Sihanoukville (B)
Today is free to explorer Sihanoukville at your own pace or just relax on the beach.

Day 12: Sihanoukville - Phnom Penh (B)
After breakfast, transfer by private A/C transport to Phnom Penh Airport for departure to next destination.