There is some bad advice in this thread. You'll only want to hunt mobs with very high base SP values and some of these suggestions don't follow that rule.
Here's a chart on mob base SP.
Most enemy types don't give a base of 150+ until such high levels that they don't become viable targets under the current rank cap. I believe raptors have the lowest HP of all 150 base mobs, which makes them the ideal targets. The problem at just about every camp, though, is that the respawn rate cannot keep up with the killing speed of even a single light party targeting enemies 10 ranks above the party (going beyond 10 ranks will not yield any additional SP).
I really do not see how full parties could possibly be viable anywhere. The respawn rate just isn't there and you'll run out of mobs in no time. Recently I was in a 5-man party where we hunted 11-14 levels above peistes (a high hp mob) at Riversmeet and even though the area is huge and has tons of peistes, they eventually went extinct and respawned extremely slowly.
Drakes have a 200 base and I'm curious if there are any viable camps with high 50s to low 60s drakes to hunt. I believe most of them are L70+, however.