Angkor: Good tip, after 5 PM it is free for the 2.5 hours to closing and by 5 all the Japanese and Koreans have split, great sunsets and of course the lack of ticket needed is grand.
Battambang: Sucks, at least Poi Pet has hustle and bustle, Battambang is just denued plains, isolated hill here and there wish some pretty wats, though if u want Buddhist Tatoos, traditional style, that is the 1 place to go.
If leaving Siem, go carefully because that is heads and tails ahead of Poi Pet for scams.
In PP, Stone Hppy said the Lake...and it is true as far as that goes, for everything but H because THAT is all stepped on crap now, run by 2 Blokes, pock faced and crew cut "David," and fat motodop Lucky...
If you need digs down there, best place hands down is World Star, up on Monviong, 2 short blocks from Street 85, the street on the side of PP Hotel, dead ends at the Cham Mosque. The Lake, Beong Keok is a cess poll and they aim to drain it but until they do, that neighbourhood is party city.
World Star has 15 and 20 US rooms, A/C and double beds, cable TV, and super safe and quiet...
But, if you want the full Lake vibe, Street 85 dead ends as I said, at the Mosque. At that point St 93 goes left and right. Facing the mosque, walk to the left and as you get to the end of the pavement, with what looks exactly like a 2 story American motel (dorm for the Mosque' Islamoic boarding school, you will see small street front shoppes down as far as you can see.
Walk 2 tiny blocks and on the right hand you will see Simon II's, a Guest House run by an expat, with 10 dollar rooms as good as Wold Star save for the crazy noise 24/7.
In front of Simon II, , facing as you were when walking from the mosque, you will see a tiny travel agency, a lane begins on your right, that 1 block lane is the path to the famed #9 Guest House. The lane is also drug city, THE place to go.
IF instead you want H (you never know so I am just saying), go to the shanty town around the train station, between Russian Blvd and the Beong Keok Lake (different shore than "The Lake."
Or...Go to the Rxs on Monviong, especially opposite the KFC that opened in 2008 in China Town. DF118/DHC was my savior at times, OTC 60 mg tabs.
Have fun.