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Firstly, when you come out of the tunnel, there is a sandy path going up to the right. You'll need a boost to get the full advantage from this. When you've got a boost, go up this path, and boost, and you'll fly off this dune and down back onto the track, saving yourself about 5-10 seconds, depending on whether you use three boosts or one.
Then, later on the same course, just when you're going across the bridge in the final straight before the finish line, if you pull left at the bridge, you can go up and over the bridge's supports, which are lined with boosts. You can do this on the right hand side as well, but if you're looking for more speed, go for the left, as there are two more boosts here.