Well, learning to roll in oppo is a must. It'll be a godsend at any park you visit.
Also, a 180 hop is only a ramp away from a disaster, so learn them and you've got 2 for 1 right there. Disasters are a good bread and butter miniramp trick. Same goes for kickturns really, if you can kickturn and backhop you're well on your way to a tyretap and that's a nice wee nugget to have both ways if possible.