If you don't have time to get to Wu Long there is a Panda research centre just outside Cheng Du (NOT THE ZOO). You can take a bus, but a taxi is only about £3 (US$6) each way. The centre is well run and has lots of info in English. When I was there they had ten cubs of less than one year old and they are so cute. They were all having their health check-up on the day I visited, but apparently you can hold one if you are there on the right day of the week.