Shaanxi History Museum: Advance reservations are required. It has 7 halls; halls 1, 2, and 3 are closed for renovations. Halls 4 and 5 are very small; the main exhibits are in halls 6 and 7. A guided tour of halls 6 and 7 costs approximately 350 yuan and takes about 2 hours. There is no self-guided audio guide. It's quite expensive.
Da Ci'en Temple: There is a free incense offering area. Climbing the Big Wild Goose Pagoda is not included; an additional fee is required. It takes about an hour to see everything.
The musical fountain at the North Square of the Big Wild Goose Pagoda is magnificent and beautiful. There are two shows at 8 pm and 9 pm, each about 20 minutes long, worth watching. Afterwards, I strolled to the Tang Paradise. This was my second visit; it wasn't anything new, just a commercial street with no shows, and the food was very expensive.
Daming Palace National Heritage Park: This was my second visit. It wasn't crowded during the week. Enter through Danfeng Gate. There's a Danfeng Gate Museum; a combined ticket allows entry. At the exit, there's a mini-train (39 yuan per person) that circles the outside of the Daming Palace National Heritage Park. From the exit, walk across the bridge to the ticket checkpoint. After entering, I recommend taking the park's electric shuttle bus. It costs 29 yuan per person, 39 yuan per person during peak season, to reach the Daming Palace Ruins Museum. I suggest buying the Ctrip all-inclusive ticket for 88 yuan, which includes the entrance fee (60 yuan), the shuttle bus, and a free guided tour. The visit inside takes about 40 minutes. After exiting the museum, you'll see a miniature landscape of Daming Palace. After viewing the miniature landscape, you can take the shuttle bus to tour the entire site. You can get off at any time, but it's not really necessary; you can see everything from the bus. The shuttle bus also provides commentary. It goes all the way to the park exit.
Xi'an City Wall
I entered from the south entrance of Yongning Gate and exited from Hanguang Gate, which took about 40 minutes. If you walk and rest occasionally, it should take about half an hour. It's very sunny in the morning during this season; I recommend going in the evening if you're in summer. There are also bicycles for rent on the city wall for 45 yuan for 3 hours.