Well, it depends what you mena by short of time I guess. We have some wonderful memories of Crete and there are some really gorgeous villages, beaches, hikes and other experiences. In one place we happened upon they just close all the streets at 7pm and all the restaurants and bars bring there tables out. Made for quite an evening.
All of the islands have their own unique character and all are worth a visit (except perhaps Rhodes which we found ghastly!) almost 6 years ago