Where is the helicopter landing pad in downtown Nanaimo? Generally I
know it is beside the "Mayo" (not sure if this correct spelling) mill
and by the Gabriola ferry terminal. I am not looking for the
helicopter landing pad at the regional airport.

Dear cutty,

Apart from the two airports, there is only one helicopter pad in
Nanaimo. It's privately owned and located close to the city enter.
Here is the address:

Long Beach Helicopters Ltd.
Nanaimo Base
2363 Cienar Drive
Nanaimo, BC
V9T 3L6
Telephone: (250) 758-0024 
Facsimile: (250) 758-2531

Search terms used:
nanaimo "helicopter pad":
://www.google.de/search?q=nanaimo+%22helicopter+pad%22&ie=UTF-8&oe=UTF-8&hl=de&meta=

Hope this is what you were looking for!
Regards,
Scriptor

This would have been a good answer if this was the helicopter landing
pad I was looking for. There is another landing pad in Nanaimo at the
Mayo Mill behind the Harbour Park Mall.