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For windy windy days and nice days.

Pimp my Boat
Impersonate an instructor
Ropework Showdowns
Tie up the instructor
Art Attack
Safety equipment modelling race
Build / Fly a kite.
Talent Show
Weather Reporter
Sailing Simulator
Build your own compass
Cardinal Mark Game
Jellyfish charts, traffic cone advoidance and jellyfish FAQ.
Quiz
Egg Drop
The Water Olympics
Chinese Drawings
Captain Jack (Boat Hopping)
Water Handball
Racing Protest
Crazy Diving Competition
Paint the Sailing Instructor
Bin Bag Fashion Show
Red Light Green Light
Hot Air Balloon

Just for nice days

The Seven Deadly Arts of DANGER SAILING
Rope Starts
Drag Races
Duffer Racing
Macgyver Training
Target Anchoring
Sailing Cricket
Rulebook racing “Protest your way to victory”
Stealth Cheating
Design your own course, no more sausages, hash browns!
Capture The Flag
Crabbing (Daggerboard Manovers)
Two Person Hiking Battles
Hairwash Hiking Competition
Tacking in the Triangle
Skiing Slalom Course (Muchas Gybing)
Picnic on an Island
Course Layouts
Blindfolded Sailing
Raft building
Boat Chasing
Talk Like A Pirate Day
RelayRaces
Box Starts
Air Bubble
The Wilson Experiment
Power Paddle Spinning
Magnet Fishing
Boom Swingin with helmet
Bailer Awareness Session (soak the guy with the ball)
Yellow submarine (bucket full weights demo)
<Pirates> Coming Alongside
MOB <Rescue Spoon>  , Reverse MOB(fun)
Capsizin Races
Water based obstacle course
Drifting sleepy races
Tony the friendly pet jellyfish
Jellyfish Fights
Fox and Hounds
Walk around the Mast Challenge
Sailing Videos
Drive-By Drawings (Comming alongside)
Adv. Coffee Monitor inclinometer
Team Racing
Treasure Hunt
America's Cup
Boat Hopping
Stunt Sailing
Capsizing Chicken
Dry Capsizing
Balloon Sea Battles
Tornado Race
Boat Ball

Five minute games

Crab Sumo
Chair Triangle Game Show
The Human Knot
People Knots
Dizzy Sticks
Bob the Weesle
Paddle/Boom Game
Ball Balance
Tugawar
Duck Duck Goose
Sit Down Circle
Doctor Muddle
Poleo
Stuck in the mud
What Time is it Mr.Wolf
Draw an Instructor
Snatch the Bacon
Wink Murder
Survivor
Build a Raft
Skipping
Rope Throwing Constest
Simon Says
Long Sighted
Spider Web
Magic Stones
The Bunny Game
Tictac
Riddles
Head Catch
Shabaz
Splat
Fishy Fishy Fishy
Clumps
Infection
Washing Line

If you've some surfboards:

Bannana Splits
Paddle Races
All Aboard
Kamakazie
Rock Gladiators
The Dunkinator
Washing Machine
Massive Sea Battle
Power Towing
Paddle Chasing
Swim-o-war
Freestyle Competition

Kayaking

Evolution
Dodgeball
Double Decker Kayak Races
Handball
Cool Runnings (Bob Sled Run)
Frog Leap

PowerBoats

Blindfolded MOB
The towline of string