Adventurer | 476 pts
I don't see a trail for the Marston Loop but here goes.
Located West of Ktaadn in Baxter State Park lies the Marston Loop, roughly a 10 mile loop that includes the summits of Mt. Coe, South Brother & North Brother. North Brother belongs in the AMC NE 4,000 footer list. South Brother belongs to the AMC NE 100 highest.
I recommend going up Mt. Coe first because it is a slide and if you have rough weather you won't regret your life. All 3 summits have killers views. I very specifically remember the narrow trail between Mt. Coe & South Brother as one of my favorite sections. From South Brother to Norther Brother you will descend fairly to the base of North Brother and then ascend quite moderately and increasing in difficult to the summit.
Ktaadn was closed the day we visited Baxter State Park due to snow and ice so we chose this hike as a backup. North Brother was very icy and provided pretty excellent pictures (one which I have shared). To the North you can bag Fort Mountain (which I have yet to acquire) and I've heard it's a bear but it's on the 100 highest so I must return.
Stay at Katahdin Stream Campground the night before as it's a decent drive from anywhere.
I loved eating at the Appalachian Trail Diner in Millinocket after or hit up Dysart's in Hermon if you can hold out (located just off Interstate 95).