GCN Peach Beach
When you get on the beach make sure to stay near the cliff as the tide comes in as it can seriously hinder your progress and it doesn't slow the ducks one bit. To stop the ducks you need to knock them down in any way (smash through the as Bullet Bill or if you are invincible or super-sized, shoot them with shells ect.). Note that there is only one place you can do a trick, and that is at the start of the beach section.
DS Yoshi Falls
This track centers around a hole with loads of waterfalls running into it. There are bridges even though it seems going through the waterfall is quicker and you can grab powerups there. The bridge, however, is recommended for newbies, because the waterfalls push you down into the hole, and the one place to do a trick is on a bridge which has a speed boost in front of it.
SNES Ghost Valley 2
This can be a hard course depending on how you look at it. For example, you might find navigating without bumping into walls easy, but you might find noting cracks in the ground near the corners hard, and that can slow you down. There are two places to do tricks. One is over a gap near the the beginning, but unless you have a mushroom and are good at steering doing a trick there is useless. The other is just behind the start line with a speed boost behind it, but do not do a sharp turn as you will just fall into the abyss.