Hey everyone! I used to play this game with my sister when I was like 4-5 and we found a way to activate the swimming in air glitch that I've never seen anywhere else. I know this forum seems to be dead but ill post it here anyways. As soon as you pass the electric gate, if you go into the lagoon and go underwater, up against the back netting you'll notice one section is lifted up in the bottom right hand corner. If you start swimming into it and slowly move upwards, you'll begin to clip through it and pop out of bounds and from here you can swim back in bounds above the water. I'm not sure if this could be useful in any of the categories but I've been holding onto this glitch for so long and have always wanted to get it out there. Hope it helps!
That's been known about for at least 8 or 9 years, but it's been obsoleted by other methods a few times.