was just there a few days ago.
for those who might be going...

1. first bus is at 7am
2. museum opens at 8:30am, so you'll have to wait a little there, which is fine to beat the crowds.
3. the bus is to the right of the train station as you face the front, as someone else mentioned.

here's a picture of the bus. lots of them. all the same, so easy to be sure you get on the right one.