It's an alday trip and it's quite far away, but it's a must see. Maybe the train would be best.
Transportation:
Railway: To get to Leshan by train, get off at Emei station. This station is 10 kilometers (about six miles) away from the gate of Mt. Emei, and 31 kilometers (about 19 miles) away from Leshan City.
Road: It is 162 kilometers (about 100 miles) from Chengdu City to Leshan City if one travels by the expressway. Emei City and Leshan City, with a distance of 31kilometers (about 19 miles) are connected by a freeway, and there is a regular bus every ten minutes. Besides, there are buses to Chongqing City, Neijiang City, Zigong City, Yibin City and Ya'an City from Leshan City. Buses to nearby counties are also available.
By water: There are very many ferries to the site of Leshan Giant Buddha every day. Ferries to Yibin City, Luzhou City and Chongqing City are available at Leshan Port.
By air: Chengdu Shuangliu International Airport (CTU) is 150 kilometers (about 93 miles) away from Leshan City by freeway. Many train and air ticket offices are set up in the city.
Admission Fee: CNY 70 (Excluding CNY 50 for a boat trip)
Opening Hours: 09:00 to 16:50
Recommended Time for a Visit: One day
Whilst there:
It looks like we can take a boat on a lake to see the Buddha,
http://www.asiaexplorers.com/china/sichu… and if you want to touch the Buddha's foot you can walk down the mountain.