Some of us have had a problem syncing multiple Google Calendars to the iPad. Here's a fix:
Enable the Safari debug on your Mac.
Set the user agent to iPhone
Go to m.google.com/sync
Turn off JavaScript
Select your iPad device
Select your calendars (it should work)
Disable/re-enable your calendars through the Exchange account you established on the iPad
There you have it
Thanks to Eric et al on the Google Help forums
Enable the Safari debug on your Mac.
Set the user agent to iPhone
Go to m.google.com/sync
Turn off JavaScript
Select your iPad device
Select your calendars (it should work)
Disable/re-enable your calendars through the Exchange account you established on the iPad
There you have it
Thanks to Eric et al on the Google Help forums