After a few days spent in the confines of a safari van Hell's Gate and Lake Naivasha offers a reprieve as you can walk around an area that's free of predators (I think). You can bike through the park and pass herds of zebra and giraffe or you can drive to the end for a short hike through a gorge. We had a terrific guide...George of the Gorge, who was an expert in all the horticultural life of Kenya. This was also a nice night to not sleep in a tent and enjoy a restaurant kitchen prepared meal.
We spent one night in the Lake Naivasha and Hell's Gate area between Maasai Mara and Amboseli. It's a nice break, however, the animal sightings are quite limited.