Ride-on 50/50
I'm doing this since I started going to the park. The ride-on grind over that taco (or whatever that type of obstacle is called) is such an easy but very satisfying trick. Holding your balance over the entire arc looks much easier than it actually is.
For the last few weeks I'm trying to turn the 50/50 into a tailslide when I'm coming down. Having enough control and balance is the hardest part to land smoothly on your tail and hold the slide for a little bit.