I need help with Gunner's quest

[Poison elf]

I think you usually come in the same spot always when landing on rumrunners. As Zep said the one by the trap door works for this quest.

Usually this is towards your left from when you enter, and where the dire wasps are. There is also another dig spot along this beach near some rock crabs, not too far from the trap door one.

Later its nice to know both these spots so when you get portraits, you can go back and forth to the to dig spots.