Big.
First - - it's Bozeman.
Second - -
A most excellent tour is a counter-clockwise, two-week loop.
First head north to Wilsall, White Sulphur Springs, and Great Falls -
Then Choteau, Browning, St. Mary to Glacier NP.
East to West on Going to the Sun Road - which doesn't open until mid June.
Then to Columbia Falls, Seeley Lake and Ovando.
From Ovando you can go Via Helena and EAST of Canyon Ferry to Townsend.
Or you can head south to Drummond, Phillipsburg, Anaconda and Butte.
Don't know how fast you tour.
If you go faster than 70 miles per day and/or don't take rest days -
Then you might want to add a day up to Many Glaicer and camp there.
Even more - start with Two Medicine and work up to Many Glacier.
Both have some of the best hiking in the park.
Or towards the end you can loop to Wisdom, Dillon, and Virginia City.
If slower, the basic loop via Helena is 60 miles per day (x12) with a day off.
PS - Time of year really matters.
May is usually too early. Always wet, often with snow. Few camping areas open.
June is iffy. Late June / early July is best time for wildflowers.
September can have an early snowstorm but is lovely. Nix October.
http://www.mapmyride.com/routes/view...=1&new_route=1