RCCL has several excursions that say "Mendenhall glacier". Since I don't want to take a helicopter I thought this was a good choice:
Mendenhall Glacier and Salmon Hatchery Tour
Approximate Duration: 2 Hours 45 Minutes
Adult: 37.00 (USD)**|**Child: 23.00 (USD)
Discover the city of Juneau with the help of an experienced local driver/guide who will tell you about the history of Juneau's gold rush era as you depart downtown. Visit the Macauley Salmon Hatchery where you see adult spawning salmon (late June through September) or have the opportunity to feed immature salmon fry (May through early June). Learn about the unique and fascinating reproductive cycles of Pacific salmon. See museum-quality exhibits that detail the hatchery's annual production of over 150 million salmon and numerous aquariums showcasing local marine wildlife.
Mendenhall Glacier is a huge glacier, 1.5 miles wide and hundreds of feet thick, fed by a 1,500-square-mile ice field outside Juneau. This meandering river of compressed blue ice ranks as the largest, most rugged glacier accessible by road. The Mendenhall Glacier Visitors Center, along with the U.S. Forest Service staff, offers a wealth of information on glaciers. It is the perfect vantage point for taking photos of this world-famous sight. Returning to Juneau, you'll visit the Chapel by the Lake, a little log church with a truly inspirational view of Auke Lake and Mendenhall Glacier.
Someone indicated on this tour - you don't get to be on the glacier - just see it.
It's my understanding that there's a visitor center next to the glacier about 10 miles or so out of Juneau. Apparently there's a trail that either winds next to or goes up to the Glacier, but I don't think you can actually walk on the glacier from there. Put your message on the Destination: Alaska board. There's at least one woman who traveled Alaska extensively that frequently responds to these kind of questions. You might also be able to find a web site specifically about the glacier and its visitor center which would give you more info. Good Luck! Actually, I think I'll look for that site because our party of 6 has decided to rent a car and drive to that visitor's center to view the glacier instead of spending mega bucks to fly over and stand on top of it (although, if you can afford it, I'm sure it's very nice; I can't tolerate helicopter rides anyway!) Shelley