You can also hunt dream sharks in Parabola for Docks Favours, unless that’s changed recently. That could be a little more accessible than Mutton Island.
Edit: Whoops, PJ beat me to it. Hunting dream sharks also gives Defender of Public Safety, IIRC, and you don’t have to draw cards for it like with the bear grind.
edited by MrUnderhill89 on 12/4/2020