I just finished Chapter 9, and I need to find some good levelling spots (I'm only Lvl 50 on one team and Lvl 43 on the other). Can anyone point me in the right direction?

I haven't made it that far. I'm still trying to sneak into the damn castle.

On the first island? Just get past the first guard and walk up to the entrance - ignore the sky pirates, cos they shouldn't kill you, even though they'll attack.