28 miles, Multiple days
This trip is done in an overnight and could be the longest trip of all the 46er climbs you've done. You will start by following the Blueberry Foot trail from the trailhead to the the Ward Brook Trail where you can set up camp at POI #2. The herdpath for the main Seward peaks begins on the east side of the first stream the Ward Brook trail crosses. The trail up Seymour starts in the same place but follows the Ward Brook trail briefly before heading away from it (use the gps track as a guide). On Seymour you will climb part of a slide on your way to the wooded summit. It doesn't matter what day you choose to take either route. If you have a really early start it might be good to knock off the main Seward Range as I did and then save Seymour for a quick climb the next day after a good rest. The main Seward Range is a 8.5 mile round trip climb from the campsite while Seymour is only 3 round trip.
Directions to the trailhead off of Corey's Road:
From the village of Tupper lake travel east on Route 30/3. Five miles from Tupper Lake when the highways split take a right staying on Rte. 3. Follow Rte 3 for 2.6 miles to Coreys road which will be on the right with a DEC marking trails on it. Follow Corey's Road south which becomes Ampersand Road. At 5.8 miles down Corey's Road you will come to the trailhead for the Blueberry Foot Trail. Park here. There is no fee.