Ditto everyone else's suggestions. I was solo tent camping in Glacier last summer (the same week that the forest ranger was killed by a grizzly bear outside of the park). First week of July. I saw lots of other wildlife, but never saw a bear the whole time I was there. :(
Get bear spray and ALWAYS carry it with you on your belt. Don't put it in your pocket or backpack where you don't have instant access. Read the instructions, make sure you know how to use it, and practice taking off and putting the safety clip back on. Chances are you'll never need to use it, but I always thought it would be much better to have it and not need it rather than need it and not have it! One of the rangers told me that she had an encounter with a grizzly in the backcountry. She said she held up her can of bear spray to show the bear that she had it, and the bear moved off away from her with no conflict.
Just pay attention to your surroundings, use common sense, and try to remain calm and not panic. When you're out on the trails, make noise. Talk, clap your hands, give a hollar once in awhile, especially when going around a bend, cresting a hill or going downhill. For the most part, bears don't want to have anything to do with people. If there are any bears around, they will probably move out of the area to avoid any conflict before you even know they're there.
I found that most of the trails that I was on had other people. I didn't always walk at the same speed as others, but you'll probably pass people, and others will pass you. There will be lots of other people around, unless you're planning on heading out into the backcountry.
If you're camping, follow all the bear management rules in the campground too. All scented items have to stay in a hard sided vehicle or bear boxes at all times. including food, beverages, including water bottles, soap, shampoo, deodorant, toothpaste, etc. Don't leave any food out, and don't pour dishwater in camp site.
more than anything, enjoy your trip! It's beautiful country!!!!
