All boats and tracks:
Get one of the top five times in any track and enter ?DL as a name. Note: Enter ?PB
as a name in the European version of the game. 

Fishing boat:
Enable all hidden tracks. Highlight the Thresher at the boat selection screen. Then,
hold L + R and press Y(2). Select the Chumdinger to race in a fishing boat. 

Quick start:
Note: This trick assumes the game is under the default controller setting. Hold L
before the race begins. When the number "3" appears release L and hold R. When
the number "2" appears, release R and hold L again. When the number "1" appears,
release L and hold R. This should result in a start with a four second boost. Adjust
your timing to when the numbers begin fading before switching buttons if you do not
get the boosted start.

Full pause screen:
Pause game play and press X + Y to remove the text from the screen. 

Medium difficulty tracks and boats:
Successfully complete all three easy difficulty tracks in first, second, or third place. 

Hard difficulty tracks and boats:
Successfully complete all medium difficulty tracks in first or second place. 

Bonus tracks and boats:
Successfully complete all medium difficulty tracks in first place to unlock the Nile
Adventure bonus track. Successfully complete this track in first place to unlock the next
bonus track. A total of four bonus tracks can be unlocked by finishing in first place. All
four bonus boats (Fishing Boat, Armed Response, Blowfish, and Tinytanic) will be
available after all four bonus tracks are unlocked.

Select two player mode and on the first three tracks medium boats and tracks will
appear: Race on the three tracks and hard boats and tracks will appear. Race on all
three tracks and the Nile track will appear. Race on the Nile and three other bonus
tracks and all boats, including the fishing and tour boats will be unlocked. Keep
playing in two player mode to always finish in first place. 

Hint: Boost in NY Disaster:
In NY Disaster, when you are racing through the left side of the subway tunnel with the
Rescue boat cutting you off and bumping into you, instead of jumping for the nine
second red boost in the center to the right, bash into the Rescue boat. Your boost level
will remain where it was for the remainder of the race.

Hint: Recommended boats:
The following is a list of the best boats to use on the easy and medium tracks.

Thunder Park track: Damn the Torpedoes
Lost Island track: Midway
Arctic Circle track: Damn the Torpedoes
Greek Isles track: Midway
Lake Powell track: Thresher
The Far East track: Thresher or Midway