Bow and atgeir work great on draugrs. Mace works great for slimes and skeletons. You rarely see a wraith unless you go at night.

Are you trying to boat in and dealing with the swamp welcoming committee? Walking in and slowly making a path with a hoe is much better if you can find a forest or meadows nearby. After you clear out the initial spawns, the respawns aren't as bad, as long as you don't walk through a spawner.