If you squint, you can just about make out 和谐安宁 in lights on the bridge:
Chaoyang Cun (潮阳村) is the network of hutongs behind the City No.2 People's Hospital (市第二人民医院), to the east of Chaoyang Shan. I reached there by following the paths off the southeast of the hillside. Map here.
There is a route up Baita Shan that takes you along the perimeter of the park itself, and brings you out on the road behind. Look for the steps that lead up to the mosque, to the right of the park entrance. As you climb, Chaoyang Shan is the hillside to the east. Map here.
Bàolóng Shān (抱龙山) is in Anning District, on the north side of the river, near the Qilihe Bridge. The route up starts from the north side of the road at Xìngfú Xiàng (幸福巷) bus stop (buses # 3, 103, 72). Walk up the small road, until you reach a 90 degree left turn. In the first picture below, don't go straight on (it becomes a dead-end). Follow the road to the left, and stay on the road until it ends, at the foot of the hills.
I stumbled across the website of Rolf Gross the other day, which has an incredible selection of photo-diaries, travel writing, and assorted essays. What caught my interest particularly was his description of a visit to Lanzhou in 1983.