If you hit Target Lock you can circle around the nests and ballistas to take them out with Dragon Breath at close range, or Fire Spheres at long range.

Did you finish clearing down the mountain path at the start of the fjords, swim over to the other beach and the path to the depleted ore mine? Once you get the barrier down, if you have not done so yet, the easiest opponents would be found continuing down the path from the depleted ore mine to High Hall and the harbour building. There is a travelling merchant along that path who you only meet once, so make sure you have lots of loot to trade with. He has
gold (50k in DKS) and a 2k malachite gem, in addition to pre-set and random stuff that may or may not be worth getting. I reloaded 3 times in DKS and got an upgrade for my belt and bracelet, and a couple weapons (bought for their enchantment formula). I forget what I bought off him in the original release of D2:ED, but I think it was more than just the malachite gem.
There are a couple caves in the starting section of the fjords, as well (one near the start of the waterfall across from the teleporter shrine, and another in the cliff a little left of where the anti-dragon shields are/were around the bunker).

On Sentinel Island you can teleport to the shrine outside, jump up the rocks and run over to where there are no overhanging tree branches in order to change into a dragon (IIRC you may also be able to find a spot on the path down to transform, or jump off and turn into a dragon before you get too deep into the poison gas). There are probably a few remaining attackers, left when you automatically returned to the battle tower, as well as a few places you can now reach as a dragon (including the ship in the tree, though you may want to use the treasure yourself, rather than complete the quest to bring it to Turgoyn, who moved up by the teleporter).

If you don't have the barrier down yet, then fly out over the water from the start of the fjords, and you should see the bunker high in the mountains behind some anti-dragon shields and defenses.
You can either use a teleporter to get up there (the Camp Sentinel View teleporter, on the west side of the island in the middle of the channel, will bring you to Camp Eagle's Nest, where you can access the bunker) or it is also possible to fly above the anti-dragon shield and drop down in human form, if you find the right spot.

Stone's fortress is the easiest one (teleporter on the north east end of the island across from the dragon cliff castle), followed by Raze (mountain across from the harbour), Broken Valley, Keara and then Kali (Rivertown Gorge).