Unlockable:

Island Flyover i Symbol Features

Collecting certain amounts of i Symbols in Free Flight mode unlocks the following features.
* 10 – You can now pop balloons! (Adds balloons to shoot with your gun)
* 20 – You can now fly in the evening!
* 30 – You can now use the double blaster!
* 40 – You can now fly at night!
* 50 – The islands are now lit up at night! (By fireworks)
* 60 – You can now fly a two-seater plane!
* 70 – The Whale Shark has a new design! (Your Mii will be pictured on the side)
* 80 – A vacation house has been built for you! (Look on the private island for an 81st point of interest!
Event Permutations

At the “Select a Mii” screen before an event starts, hold 2 while pressing A to choose “OK.” You can let go of 2 when you see the black warning / info screen. This will have the following effects on certain Events:
* Airs Sports Island Flyover – Eliminate all balloons and i-Points
* Air Sports Skydiving – Play the intro Skydiving event
* Archery – Eliminate aiming circle (difficult!)
* Basketball Pickup Game – Play at night
* Frisbee Golf – Eliminate information on the screen including wind direction / speed and the distance to the hole
* Golf – Eliminate information on the screen including wind direction / speed and the distance to the hole
* Swordplay Duel – Play in the evening
* Table Tennis Match – Play a faster, 11-point match
Three Holes – Special Course

Beat every course with a total score of under par for each (-1 or lower) to unlock the mystery course called “Three Holes – Special.” You can do this for both Golf and Frisbee Golf. Unlocking the course for one will not do the same for the other.
Samurai Armor
Beat the champion in Duel Mode and your Mii will have upgraded Samurai Armor
Swordplay Duel Upgrades

Reach a score of 1000 to unlock special Samurai armor. After you reach a score lever of 1500, you’ll fight the Champion — a special match set in the evening sunset. Defeat him or her and you’ll be able to hold 1 at the Mii Select screen while choosing “OK” with A to unlock a purple sword!
Swordplay Showdown Reverse Mode
Beat the Volcano round to unlock Reverse rounds where you can play all ten original rounds backwards.
Additional Wakeboarding Levels
On the Wakeboarding event, get your overall event score to 400-500 to unlock Intermediate level. Expert is unlocked when you get to about 800-900.
Shoe Paddle for Table Tennis Match

You must play and beat the champion (get an event score of about 1500) before doing this.

At the “Select a Mii” screen before an event starts, hold 1 while pressing A to choose “OK.” You can let go of 1 when you see the black warning / info screen. This will unlock a shoe as a paddle for Table Tennis Match.
Power Cruise Slalom Courses

There are three unlock able courses you may unlock via your overall event point score or just playing the game:
* Slalom Course Marina – Get 350-400 overall event points (or play 5 times)
* Slalom Course Cavern – Get 650-700 overall event points (or play 10 times)
* Slalom Course Shoals – Get 850-900 overall event points (or play 15 times)
Cycling Unlockables
Meet the requirements below to unlock additional courses and longer races! For the longer races, you’ll actually race in stages. Each day a different race will allow you to gain ground on your many opponents. On the final day you’ll need to fight for first!
* 1-Stage Race – Over Talon Rock – Play 3 1- Stage Races
* 1-Stage Race – Up the Volcano – Play 5 1-Stage Races
* 1-Stage Race – Into Maka Wahu – Play 7 1-Stage Races
* 3-Stage Race A – Play 3 1-Stage Races
* 3-Stage Race B – Play 3 3-Stage Races
* 6-Stage Race – Get about 650 event points.
Basket Bike for Cycling

Once you’ve attained Pro status in the Cycling, you can hold down 1 when choosing you Mii to use a ‘basket bike.’ The ‘basket bike’ either has a picture of a pizza or some flowers on it depending on your Mii’s gender.