For anyone who may have been interested, the "Tracy Arm Fjord & Glacier Explorer" excursion is now available for booking on rssc.com. We are going to sign up as I've read many positive reviews on this one.

Tracy Arm Fjord & Glacier Explorer

Duration: 6 Hours.
Seated.

Join us for an exclusive opportunity to see the very best of the Tracy Arm wilderness area, and an exciting close-up view of the majestic Sawyer Glaciers.
You'll board a, high-speed catamaran directly from the Seven Seas Mariner. Relax in the warm, spacious cabin, surrounded by large windows as your experienced captain guides you past curious seals resting on floating icebergs and extraordinary up-close views of South Sawyer Glacier.
From the topside observation decks, you'll simply adore this unforgettable sensory experience. At times, you can feel immense spires of ice break from the glacier and crash into the sea. Before leaving Tracy Arm, you'll view the beautiful North Sawyer Glacier, which cannot be approached by large cruise ships.
While exploring the length of this ice-carved fjord, you'll cruise beneath cliffs that rise 4,000 feet above the jade-colored sea. There will be frequent stops to view and photograph wildlife, including Pigeon Guillemots, Bald Eagles, Harbor Seals, and on occasion, Mountain Goats and Black Bear. Feel the mist on your face as the vessel maneuvers almost directly under a plunging waterfall.
Departing Tracy Arm, the onboard naturalist will relate interesting information about the area, called "one of the most dramatically stunning fjords of Southeast Alaska" by naturalist John Muir. Enjoy complimentary snacks and beverages served by your friendly Alaskan crew on the cruise from Stephens Passage north to Juneau.
Provided: Binoculars and snacks.
Please note: To fully enjoy the outside observation deck, dress warmly and bring a rainproof jacket, hat and gloves. Vessel is equipped with restrooms. The tour will disembark next to the Seven Seas Mariner in downtown Juneau. A hearty snack will be served onboard the catamaran upon arrival, so those participating in an afternoon tour need not worry about lunch. This tour is available from June onwards. This tour will not rejoin the ship in Juneau until 1:15pm, we recommend not scheduling another tour until after 1:45pm. Please check actual departure times carefully once on board.