Our tuk tuk driver suggested we check out the war museum. It was all outdoors and pretty much a collection of rusted war equipments like guns, tanks, and a helicopter. US$5 to get in seemed steep for the area given you can buy a meal for 3 at the same price. I didn't opt for the "free" tour that offered us, I later found out they practically demand a $20pp donaton. If you do get the tour, the donation amount is negotiable so you don't have to pay the amount they ask for.