In the month or so that I’ve spent in Kenya, almost all of it was in Nairobi or other cities for writing assignments. But I highly recommend you check out Hell’s Gate National Park:
Hell’s Gate National Park (Naivasha) – Less than two hours by matatu west of Nairobi, this is a crazy-beautiful park that allows you to mountain bike through it – a very different experience from the typical safari. You can also stay the night within the park at Ol Dubai; we opted for a lodge a few kilometers away, the name of which escapes me. The park fee is $25 and renting a bike is anywhere from $6-10.