Motorbikes cost from US$5 to US$10 to rent around town. Ask your guesthouse or hotel or negotiate with a moto driver. There are no 250cc dirt bikes available for rent here, so hire one in Phnom Penh if you want more muscle. Pick-up trucks and 4WDs can be chartered for the day. It costs about US$40 or so around Sen Monorom in the dry season, and more again in the wet season.