Recover a Black Chest.
 

I need to recover a black chest from Isla Canjegros, but there are so many monsters that I cant even get a good look around.

There are a few dig spots there, check out this thread:

http://www.piratesonlineforums.com/f...ead.php?t=2155

That thread only shows a dig spot for an arm. The thing that I worry about is all the undead skeletons and crabs that constantly send me back to Tortuga.

The crabs can usually be avoided. Its always best to have a friend along that distract the critters close by while you dig. :)

I have no one that still plays on my friends list though.

And to heal you.

Yea i think there is one near the place you dock where there are very little enemies its in the green/sandy area.

Sorry should have clarified. I realize that that pic is refering to the arm, but that dig spot can also be used for any other dig quest you have on Cangrejos.

If you need help to avoid dying, ASK. A busier server is probably your best bet if you're asking randoms for assistance, and who knows, you may make a new friend or two. May even find someone who needs help with the same quest.