We went for the Kiulu river (Grade I-II) white water rafting, had a really good experience even though all of us were first time rafters. The guide Jeff and Lilo were very friendly and professional, the ride itself was quite relaxed for the most part as we ride with the river flow while rafting through a few rapids.
Lunch was included in the package, and it was cooked fresh at the beautiful Riverbug base camp at the end of the river. It was simple but delicious, and vegetarian options were available as well. Shower facilities available at the base camp.
Upon request, they have van transfer service available to and fro your place of stay and the rafting location (subjected to availability). You can drive yourself there as well, but the road condition is similar if not worse than the road to Kundasang.
Besides rafting, other activities such as camping, small flying fox across the river and back, etc are also available at the base camp, though we did not participate in them.