The biggest line is scary but can be done on a BMX bike apparently. The guy on the 20" said it was his first run at them too. The jump above is pretty lofty, but it is also at the top of the mountain so it feels like your're way up there. The medium line is very fast, flowy and easy. Can't wait to go back when it is ~55*F out instead of sunny 85*. I looked like a turnip after only a few all-day rides.
These step downs were fun but I bottomed my fork out easily (they are 20-25' out and 6' down). This dude hit them on a 20".