The muzzy only units are 602/603/607 (early) and 601/618 (late). 602 has lots of roads and clearcuts, lots of timber co land so might need a bicycle. You can drive all over on mainlines and keep switching from state to timber leased. The roads are pretty good and not too steep. Quite a bit of small alder swamps and small streams. 603 is similar to 602 but has some national park and national forest, more of a pain to drive around in. 607 shares a lot of boundary with the national park. Most of 607 is national forest and hasn't been logged for a while. There are a few roads through here that are maintained, but also slides and washouts that don't get repaired. These units are crowded during the early muzzy. 601 is small and is tough to find legal areas. You can try to access from the highway between Neah Bay and Seiku or drive along a maze of logging roads, might be driving a while. 618 is surrounded by national park and reservation, the majority of it is national forest. I'd say scout early or get a recent (real recent) map of that one. Some of the roads that used to go for many miles have had lots of culverts removed and the roads blocked with boulders. I don't think the FS is planning to reinstate those roads. It can get real swampy in there too.
621 is permit only, and I think the area around Sequim is master hunter/youth only. There are a few animals in 621, but the huntable ones are down by Brinnon, and seem to like to hang out on the private property. If you are a good people person, you might find a willing landowner.
612 and 615 didn't have muzzy only season. You could try the special permit though. You could get the permit with a modern tag and then hunt with a muzzy. Lots of places to explore in 615. 612 has a bunch of logging and roads. Similar to 602. 615 borders the national park and has some major river drainages. Some of the drainages are less steep than others. The roads can be tight and windy in places and the terrain very rough. 607,615, and 618 have rainforests and can be really mossy and thick.