Actual tip most people don't know: you can throw a downward bubble by holding down before using the wand while falling.

To extend Mysticwizard's comment: it is possible to jump, throw and land on the frisbee in a single move, meaning you don't need to bounce the frisbee before juming onto it. To do this, jump forward and throw the frisbee right as you reach the peak of the jump. You will immediately land on the frisbee and fly. This move can be chained to gain altitude.

Now this is very limited use, but you can gain height in thin vertical tunnels by chaining frisbee rides. The timing is razor thin, and gets tighter the more narrow the tunnel, but I was able to unintentionally sequence break a few times with it (I thought it was what I was supposed to do then realized I'd skipped large chunks of areas and couldn't keep going).

Basic idea is to jump into the tunnel, throw the frisbee and land on it (harder than it sounds when coming up from underneath), then jump and throw it again ASAP like with bubble jumps. Try to hold down the jump for maximum height and try to do it when in the dead center of the tube or it'll bounce right back before you get on top. It's super risky because it still fails half the time and is essentially useless, but it's cool to pull off.

If you hold down while using the bubble wand, you create a bubble right beneath you, which lets you bubble jump infinitely vertically, but I can't get it to work when its only 1 block wide, the bubbles won't appear

Another one: you can use the glow of the flute notes to see in dark areas if you don't want to spend firecrackers.

You can also coyote jump off the bubbles to prevent them from popping (step off the bubble and jump in mid-air within a few frames of stepping off), though that is generally less useful than normal bubble jumping.

Stalagmites only hurt you if you fall onto them, so if you position yourself just right so that you reach a platform with a stalagmite on at the peak of your jump you can land on it without getting hurt. This is not very useful as you can just break stalactitets and stalagmites with your toys.

You can use the flute to fast travel to the warp hub by playing the song taught by the fish there (right, right, left, left, down, down, up, up)

Firecrackers will wake up and scare off most animals.

This one might be a bit off topic, but you can skip the ostrich boss by dropping the slinky toy and yourself onto the buttons to open the gate to the flame. Use the yoyo to trigger the trapdoors.

JUST CALL IT BUBBLE JUMP!!!!!!!

It is possible to bubble hop in a straight column. Timing your jumps with the creation of the bubble below you. It is way harder, but you are able to climb vertical paths that don't have an horizontal margin for the normal bubble hop.

Hop onto chinchilla, use yo yo to get the chinchilla to move :D

If you time it just right, you can land on your frisbee right after throwing it in midair.