Get 'em while they last. Glacier Bay is just one of those places you should try to experience up close and personal. Maybe some day you'll regale your progeny with memories of massive ice sheets cascading into the sea below. And though it can be difficult to get to, you won't regret the effort.
The easiest way to get to Glacier Bay is to fly into Juneau and either take a flight or boat to Gustavus, Alaska. Don't take your vehicle, though it is possible via the Alaska ferry system (which is a good choice for those bringing kayaks or bikes). Instead, grab a taxi down the 10 mile road that connects Gustavus with Bartlett Cove, or buses on a limited schedule. Check out the National Park Service suggestions on how to do one-day tours (or extend your stay and camp there or crash at the lodge when it's open in the warmer months).
One of the best ways to see the glaciers is via boat, so book a tour with some of the various outfitters. When there, don't miss one of the largest humpback whale skeletons in the world near the Visitor Center, and the 4-mile round trip Bartlett Lake/River Trail.
Get to know more about the park, here.
Though the park is open year round, visit in late May to early September when services are in full swing. In the winter, be prepared to be very self-sufficient.
Surprisingly, no entrance fees are required for private visitors to Glacier Bay. Though do check out information on reservations and backcountry permits, here.
Because the developed area is relatively small, this isn't the best park to bring a pet too. However, there are places Fido can join, which you can see here.