It is a 1-hour drive by motorbike from Hoi An, assuming you find your way the first time! The park is open 8-5, but the later afternoon hours are calmer and not too hot. Bring water.
One way to visit My Son is to join an organized tour from Hoi An, which is about one hour away. Any hotel or travel agent will be chomping at the bit to set you up with one. The cost can be absurdly low — US$3 will get you there and back on a bus, or you can do the trip in a bus and a boat, with lunch and an extra stop or two, for US$5. Neither includes the cost of admission to My Son, though, which is 60,000 dong (US$3 Feb 2012).
The assembly, toilet, and snack times take away the rest. The bus will make the rounds starting at 8:00 am picking booked tourists from each hotel. It is ridiculous why it has to make a stop over rest at a restaurant for more than 30 minutes when people were expected to have just jumped out of their bed and had breakfast a bit of a few moments ago. The arrival time at the last assembly point inside the complex is at 10:30 am (the sun is already high up) for one final briefing. By then almost everyone is grumbling and frustrated at the too much idle time spent while listening to the last instruction - "Be here by 11:30 am." Then everybody dashes out for the path leading to the first attraction group. Each group is separated by about 3 to 10 minutes of moderately brisk walking and there are about four visitable groups plus the more than 10 minutes walk to and from the Assembly point (there is another assembly point by the restaurant outside the complex and another 30 minutes plus of killing time). Here's the time line: Walk from Assembly Point to 1st group in 8 minutes -- See 1st Group in 3 minutes -- Walk to 2nd Group in 10 minutes -- See 2nd Group in 8 minutes - Walk to 3rd Group in 3 minutes -- See 3rd Group in 3 minutes -- Walk to 4th Group in 10 minutes -- See 4th Group in 3 minutes -- Walk to Assembly Point in 12 minutes. Synchronized with
