Sony Playstation Games Solutions - One of
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After the Blue Boost that's
hanging out in the air, you'll hit a bunch of small waterfalls followed
by a Tunnel. If you jump on top of the Tunnel, you'll cut you're time in
half for that section.
Venice Canals Shortcut
When you get to the part
with the three hard turns in a row (left, right, left) you can skip all
of this by jumping over the island in between them both. This comes
shortly after the part with the docks.