No much things to do there in the rainy season, otherwise you can rent a motor bike and take time to visit the latex factory in Chup or find out your way to Moha Leap pagoda or a walk around on Koh Pen island.
A friendly relaxing place with some intersting sites and a river with restaurants on its banks. Watching the 60 or so fishing boats at work was interesting and entertaining.
I am surprised there are any fish left.
Apart from the 7 Makara Hotel I enjoyed Kompong Cham as a town to relax in and also crossing on the Bamboo bridge to visit the island passing many interesting local dwellings.
Visiting the Men's and Women's pagodas about 8km west of town. In addition to visiting the Mekong Crossing Restaurant several times, I also had a good relaxing dinner at the Smiles restaurant which has a charity link.