My wife and I will be staying at the Wenjun Mansion Hotel Chengdu in October.

From your hotel, walk northeast around 450 yards to get to Tonghuimen Station.
Take subway line 2 to Chunxi Road and transfer to subway line 3 to Xinnanmen Station, Exit D. Walk southwest around 300 yards to find Xinnanmen Bus Station. After arriving, you can easily find several direct long-distance buses to scenic area. The bus schedules are from 07:50 to 18:00. The duration is around 1.5 hours. The ticket fare of the bus is CNY 16 per person.