First, Zaz- please.  Do your homework.  He does not own any part of the glacier.  He owns a road and parking lot.
Next, I would hope his property is well-marked.  Simply skirt the edge to the glacier from the road.
Lastly, if you do not trespass his land, and he prohibits you from accessing the glacier on public lands (read: State of Alaska DNR or OUR LANDS), then sue.  And I mean, for damages.  He does have commercial general liability insurance.  I bet it's a $1M policy.  That would set him straight.