Do it as part of all the temples , will give you a chance to see the country side
We hired the tuk tuk that picked us up from the airport , If you are comfortable walking then he will take you to Angor Wat , Angor Tom ( Bayon Temple ) , Ta Prom and Banteay Srei all in one day , so you can complete them in a day pass ( $20 per day ) and the next day you can do Beng Mealea the next day . The tuk tuk rental for the first day was $39 and I think it is $ 40 to visit Beng Mealea . The price list for tuk tuk will be in the room or the font desk can provide it., if you are solo you have the option to take the mini bus etc .. check with the front desk.
The name if my driver was Toluah and his number is 0886644479.
I stayed close to Pub Street
We had to leave early to see the sunset ( 5 am ) , it will be crowded but I think you can miss this if you don't want a sun rise picture with the temple in backdrop , its mostly a photo event.
However get there early say around 6 am before the crowds get thereMore