I'm guessing the Tourney will be all pre-drilled holes so you will be limited to where you can fish anyways. Probably near Marina Bay or the Beach?
A few tips for the Kids:
Whitefish:
Fish in 5 - 15' of water, use a WireWorm tipped with a maggot, lower it to 6" off bottom, jig it 2 -3 times then stop. Bright colors will attact the fish then when you stop they will come in for a closer look. Keep your eyes glued to the bait at all times, the Whities will often swim up to your hook and watch it for a minute or so. This is almost as exciting as catching a fish!
Perch:
Usually in deep water 20' +, so depending on where you are you might catch a few. They tend to be hard to locate and I've always moved around quite a bit to keep on top of them, might not be an option in the tounament. I like small spoons & jiggn' Rapalas tipped with either small minnows or meal worms.
Jig 12" off bottom, if they are really bitting keep your line tight on the way in the hole cause they will sometimes hit on the way down as well.
Pike:
I personally would not target pike if you have a bunch of youngsters with you, they require alot of patience, wire leaders, and bigger gear that will detur the perch & whitefish from bitting. If someone hooks one great! Don't get me wrong they are the most fun to fight and the most difficult to land (if its big anyways). That being said, if the tournement is based on size for prizes the kids might have to compromize quantity for quality....not sure how it will work. Read your regs on the size limit in place for pike as well.
Walley:
Catch n' Release only! Same as perch, deep water, jig a minnow just off bottom.
Ling Cod:
Still fish right on bottom with a minnow & small jig, usually late afternoon is best.
I am not a pro by any means of the imagination so hopefully some others will post their tricks and sectrets as well and correct me in what I am doing wrong. Hope this helps, good luck and most importantly have fun.