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Standard Boat Tours (morning and evening cruise) available (US$5), kayak tours (US$9) or daily rent (US$7) (e.g., at Captain Chim's Guesthouse at the Old Market). Look around and compare different operators, as the boat tours range from spring break backpacker partying to calm, romantic, and family friendly. You can buy moderately priced food and drinks on board, and if you do a sunset tour you might see fireflies.
There are lots of durian farms on the way to Teuk Chhou Rapids. It may be hard to communicate to a tuk-tuk driver that this is what you want to see, but a tourist office / travel agent can help you arrange it. There don't seem to be organized guided tours like for the pepper farms, but you can go to a plantation and ask for permission to look around – before you leave, buy some fruit as a thank-you. Even when durian is out of season it's mildly interesting; in January you can see the unripe fruit starting to grow.
Stand Up paddleboarding, SUP lessons and tours. Kayak rentals, swimming and cafe.