Guide & Driver can pick you up at Phnom Penh or Siem Reap if depend on your flight. Siem Reap you can spend for 2/3 days and Phreahvihea for 1day. We driving pass Steung Treng province to Ratanakiri we spend there for 2/3days and we leave from Ratanakiri to Mondolkiri we spend for 2/3days and we can continue to visit Phnom Penh for 2day after Phnom Penh can choose Sihanouk vill for 2day for relaxing or after Sihanouk you can go to see Battambang province for 2day and stop to see Banteay Meanchey for 1temple and back to Siem Reap.