GCN Peach Beach

From MarioWiki

Avoiding the water will be your top priority here, as even the shallow stuff slows you down. Taking a hard left onto the docks near the start leads you to a hidden ramp with some power-ups, just be sure to hit it dead centre so that you don't drown in the deep sea upon landing. On the home straight, there's a longer detour you can take to the left of the large fountain (visible on the overhead map) which leads to a stash of additional power-ups, but considering this road is already littered with the darn things it's a huge waste of time and best avoided. Note that the duckbilled enemies on the beach will home in on you if you get too close, so swerve wide, or shoot them down with shells.