I would like to visit Phoenix Town and I can choose 2 from Wulingyuan, Zhangjiajie, Tianzi to visit (which 2 should I choose?).

What is your suggested itinerary for those attractions and what is the best time to visit those attractions? I am from Vietnam so don't really know where to start my trip to cover all those attractions and I will have 4-5 days for my trip.
Many thanks for all the suggestions, would be very appreciate if someone can recommend nice 3-star hotel along with the itinerary.