Replying to After hours rails/boxes in whistler

Anyone know of any after-hours terrain for rails/boxes in whistler.  I am looking for easy/beginner terrain (not urban rails!).  I am taking my 8 year old son out there in a couple of weeks.  It looks like the hills close at 3 and there is no night skiing.  Was hoping there was something near one of the bases that he could spend a few hours hiking at the end of the day or in the evenings.

any help or suggestions appreciated...