There will come a time when you want to take a break from the temple scene. Head to the Land Mine Museum, your motorbike driver will know where it is.
The museum is outdoors on a small, enclosed property. There is a hut sort of shelter that houses all sorts of land mine and bomb shells, each of which has had the explosives removed. Alongside the piles of ammunition are descriptions of how they functioned and their history and uses. There are also some big guns and rifles in another smaller shelter. There is a "garden" type display, roped off, which displays all the different types of mines as they would look on the ground as they were set. This is pretty interesting, but it is difficult to make out where each one is. Also, if you've been searching for that Cambodian police uniform, you'll find it here in the little gift area.
The really cool thing about the museum is the story about the guy who started it and still runs it. There is a pamphlet that describes his past at the museum. If I remember correctly, his parents were killed by the Khmer Rouge and they forced him to lay landmines. Then The Vietnamese captured him and forced him to do the same for them. Now he has dedicated his life to getting rid of landmines.