We took the Oudong Trail ride with knowledgable and mellow Grasshopper guide Amom. The 65k ride was a great blend of Phnom Penh morning rush, challenging ride on a path along the railroad tracks, relaxing cruising on paths along the rice paddies where the rice harvest was in operation, through shanty towns and hamlets, visits to small stores and a beautiful new temple, finally ending up at a cafe/shady resort next to Oudong Mountain in mid-afternoon with an optional walk up the 500+ stairs of a very famous stupa (commemorative monument containing relics; in this case, bones of the Buddha). Amom gave us a lot of local history--new and old--on the settlements along the railroad, growing industrial development, temples, and the former capitol of the country, along with some explanation of Buddhist religious practices in the provinces. She safely guided us through the crowded Phnom Penh streets and out into the real Cambodia. Amazing to be riding along a crowded boulevard, turn off at the railroad and soon be out in the province country of wetlands, rice paddies, small towns. Oh yes and countless friendly children running up to yell, "Hello! Hello!" Grasshopper provides sturdy mountain bikes, helmets, water, fruit snacks and water rest breaks, lunch and transport back to town. The pace is not fast--fine for the moderately active. Take the Saturday morning ride with Amom--she rocks!
If you have traveled much in developing countries, you already probably know that tourists are seen as a big revenue source by local folks. So--although your fee to Grasshopper covers all trip expenses, you may wan to bring a small amount of riel (local currency) for the market, beggars and children who want to be your 'tour guide' at the sacred mountain. Or else practice saying "ot-dae, som-tuh" (my Anglicized Khmer for "no, sorry") . Great ride, great day.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.