Your last big adventure? Uh oh -- I hope that does not mean you will no longer be our moderator!!
If you hike, the whole North Cascades area (Highway 2 and 20) is wonderful. If you are not a serious hiker, there are some great and easy pathways at the end of the Mt. Baker highway (542), at Artist Point. For example, this is a shot of Mt. Shuksan taken right from the road -- the lake is named "Picture Lake," for some odd reason:
Click For Full-Size Image.
And yes, those are glaciers tumbling off the cliffs on the mountainside.
Be aware that late August and all through September is prime berry season -- not only blackberries but also huckleberries and wild mountain blueberries. Just be careful not to eat too many at one sitting. Please do not ask how I learned this.