Things to look for:
- quick to put up, better if the tent just catches onto the poles with little hooks rather than requiring pole threading through sleeves.
- dual skin, if it's hot, or really raining heavily then two separate layers of material are much to your benefit
- free standing (most tents do this now), if you're pitching on really hard ground then it's good if the tent can be put up without actually having to push pegs into the ground. (Careful that it doesn't blow away like a tumbleweed though)