There are buses to Meishan in Shiyangchang, Xinnanmen, North Railway Station and Jinsha Station in Chengdu. It takes about an hour to get to Meishan, but I suggest you go to Xinnanmen Bus Station, where the bus is more comfortable, and the buses from other stations are ok.

There are taxis in Meishan, which are very cheap, starting from 4 yuan.

for half a day, I suggest you visit the Sansu Temple in Meishan, which is the former residence of Su Shi, a litterateur in the Song Dynasty, Su Xun, Su Shi and Su Zhe. You can learn a lot about the culture of the Song Dynasty there. Of course, you can also go to Yuanjing Building, which is a leisure place with a good new development environment. There are many local specialties nearby: when you go to Meishan, you must try authentic Dongpo elbow, Dongpo meat and Dongpo fish. . . . . Of course, you're looking for a slightly better hotel. The bicycle rental you mentioned is a good way to enjoy the scenery slowly. It seems that there was a place to rent bicycles in Xiaxi Street before. But if you are not a local, I suggest you take a taxi, which is cheap!

There are many buses going back to Chengdu. As long as you don't go on holidays or weekends, it's very convenient to go back to Chengdu.