We booked the two day Cat Tien trek followed by the four day Mekong cycle tour ending in Ha Tien. We paid a little extra in order to choose the 'luxury' hotels. Everything about the experience was excellent. Replies to emails during the booking process were prompt and helpful. The tours were amazing - our guide, Ut, was so friendly, knowledgable and helpful. He is also an excellent cyclist. Our driver, Kiet, was quietly efficient - always providing us with water and assisting us with the bikes.
The cycling tour is a great mix of cycling and activities including visits to local plantations (rice, fruit etc), religious sites, minority communities, a crocodile farm, a fish farm, a frog farm, the floating market, boat trips, and manufacturers including candy and brick etc. The amount of cycling can vary depending on ability but we cycled about 30-60km each day. Most of the cycling is through local communities and it is amazing to see how the locals live - they are all so friendly. Our guide gave us insightful bits of history along the way. The bikes are of a good quality. The 'luxury' hotels were decent but please don't expect them to be western luxury.