Overall, the scenic area is quite nice. I entered through Gate 6, Qin Yan Tower, passed Erwang Temple, Anlan Suspension Bridge, Fish Mouth, Feisha Weir, and Baopingkou, and exited through Gate 1 of Fulong Temple. The gatekeepers are located at Nanqiao Bridge and the ancient city of Guanxian. Actually, 3 hours is enough for the whole tour. If you walk quickly, 2 hours is also possible.
Dujiangyan is a cultural landscape. Regarding whether or not to hire a guide, hiring a good one is advisable if you can afford it. Because I did my research beforehand, I didn't hire one. I'm unsure if the guide's content would meet my needs.