I would like to make some positive remarks on Awash national park, as I read mostly negative remarks.
When I was there we visited the place only for one day with 3 students and driver in a private car. You should not at all expect to see high amounts of wildlife, that is really the wrong attitude. But if you are lucky you can see some nice mammals (we saw beisa oryx, greater kudu, warthog, baboons and soemmering’s gazelle) and the bird life is superb. Moreover, the landscape is increadebly nice; the falls and the gorge, the savanna, but also the warmwater sources, surrounded by palm trees in the north, located in a deserted landscape where Afar boys roam with their cattle. Definitely visit that site too!