try the tunnel at the foot of yonge street downtown. The best tunnels I have ridden are the tunnels on Sepulveda Road under LAX airport. Here is a youtube video I found online
http://www.youtube.com/watch?v=SM7pojQrqCU
The other is Angeles Crest Tunnel in LA here is a youtube video both awesome
http://www.youtube.com/watch?v=H0I5-rlhJOc
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