Your hiking trip starts from Qiaotou, the 28 zigzaging turns will be a real stuff. The 26km takes about 6-8 hours. From the top of "28 turns" on the high path further uphill to a place of altitude above 3000m, you can have a view of the panorama of the entire Gorge. Check this at a Tea Horse or Guesthouse if you cannot figure it out yourself. 
You will arrive at Halfway Guesthouse to finish today's trekking.  At an altitude of 2500m, you get a magnificent view over the Yangtze River below and the Yulong Mountain right in front of you. For the keen photographer this trek provides a great opportunity to capture nature's best moments.
Halfway Guesthouse organizes two-day treks up Haba Snow Mountain with an overnight stay uphill at a point of altitude above 4000 meters. Sleeping bags and mats for the trek can be rented at the guesthouse. Successful trekkers are awarded "donkey shoes" as souvenirs and their names and contact information are recorded in the "donkey skin book" at the guesthouse. Similar treks can also be arranged at Five Fingers Mountain Guesthouse.

Three roads lead to the Middle Rapids. One starts at the right of Woody No.2 (Y2 for "road crossing" fee), another starts near Teacher Zhang's Guesthouse (Y5 "road crossing" fee), the third starts near Chateau Woody where you see a sign advertising Xia Yin Gu's guide service. Once you enter, just go down and you won't miss it! The scenery is the most spectacular in the entire Tiger Leaping Gorge.
To return, you may go back on the same road, or take a different one. Notice that on the third road close to the rapids there is a very dangerous section of a few dozen meters long called "Tiny Sky" (and you need to pay between Y2-5 depending on the condition to cross that). At the rapids itself, there are two places charging "road crossing" fees of 2Y each: one for a small bridge leading to the first road, the other for crossing the wooden plank to the Middle Tiger Leaping Rock. The visit takes between 3 and 5 hours.
Reminders:
Beware of the touts hanging around various guesthouses on the low path (Walnut Grove included except at Sean's Guesthouse): Offending these people may incur a harsh beating plus a demand for hefty money.It's out of electricity sometimes in Walnut Grove, makes sure you have a flashlight.

An adventurous add-on to the gorge trek is to continue north all the way to Haba village and the limestone terraces of Baishuitai, making it a four-day trek from Qiaotou. From here you will travel on to Zhongdian.

From Walnut Grove to Haba via Jiangbian, it's about 30km and much of it is uphill, which takes 7-8 hours, more difficult than the high trail of the Tiger Leaping Gorge.  After a long ascent, you will reach the village of Haba for the night.  A few hundred residents in Haba, many of them are Muslim, and a couple of guesthouses tucked into a valley that spills down a hillside with mountains rising on three sides make up Haba. The Haba Snow Mountain Inn, a typical rural Yunnan guesthouse - a family farm with a couple of rooms converted to guesthouse use.

A brief steep ascent in the beginning and a couple of steep descents are the only diversions from what is otherwise largely a flat trek and certainly much easier than the Walnut Grove to Haba portion. Baishuitai (White Water Terrace), believed to be the birthplace of Naxi Dongba culture, is not as nice as Haba. A cluster of buildings around the base of the terraces themselves form the de-facto town of Baishuitai, which falls under the denomination of Sanba town. The main attraction is the limestone terraces, though interesting to see and worth the Y30 of admission. Basic accommodation is available in the town for Y10/bed. Off the main road most of the local dwellings are in the Naxi style and feature the twin-fish motif. For moving on, the first bus to Zhongdian departs at 8:30AM, while others pass through throughout the day - either heading north to Zhongdian or south to Haba, Jiangbian, Tiger Leaping Gorge or Lijiang. On your ride to Zhongdian (4 hours), you can get off at the turn-off to Bita Lake, 25km east of Zhongdian and hike there.