1911,
I don't think you'll be able to carry a sidearm in the National Park (I promise not to tell the wife though!).
You may have to rely on pepper spray which works very well in most situations - if you can get the awkward little cannister deployed in time!
I think theres a great money-making opportunity for someone to develop a pepper spray can thats actually ergonomic, pointable and quick to employ. The ones available now are set up like a can of bug spray and have a weird little safety tab thats awkward to get off. If you see a bear coming your way and you can get ready, great! If you're surprised (usually the case), you're hosed.
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Keith
The Bears and Bear Maulings Page:
members.xoom.com/keithrogan