Here is a snap of our hotel. If eating at the hotel, you could dine inside or in this courtyard. In the background is the raised pool. Nice elephant, eh?
While we were at Tara Angkor, three different tour groups rolled through the hotel, a French one, a Russian one and a USA one. I imagine if you had bad timing and a large group was there for a long stay, it might be a bummer. They did close the pool one evening for a tour group function, but other than that, pretty much a non-issue.
In Cambodia, it really doesn’t make sense to change any money because the town, at least Siem Reap runs on USD. Marked or torn USD will often be refused since banks will either not take them or will give less value for them. Ouch!