We have not been camping much in recent years, but this last year we went to Lake Wenatchee State Park and they had some cute cabins. A nice park for the kids, a swimming area and a boat launch w/dock overnight dock space! (a must for us!)Anyways, the cabins looked cute (we were in a tent) and we would go back again!
Re: Favorite places to cabin camp
We mostly tent camp, but agree w/ Lake Wenatachee. There are dozens of places on Highway 2 and another favorite of ours is up on the Skagit River.
Not east, but Scenic Beach is a great location too, near Poulsbo.