

The giants and mammoths will be unable to get to you, and since they are 100% reliant on melee, you are untouchable.

Make your way to an area of the rock with a good viewpoint, and hopefully some cover to crouch back out of view and re-hide yourself. Get a weak bow (hunting/imperial) and a ton of Iron or Steel arrows and find a giant location in the wilderness (icon looks like a mammoth head w/ tusks, or an octopus) with a few giants and a large, unclimbable rock.

There are several effective ways to level archery in Skyrim.
