Ditto on what Lisa said...
Also from Forester, et al, you're 2.6 times more likely to have a crash riding on a bike path or multi-use path than you are if you get out, mix it up, and ride in rush hour commuting traffic. (The underlying reason being the mixing of bikes with pedestrians in the same space. Pedestrians have no rules, they can dart, stop, turn at will, where at least cars and bikes are supposed to be following the same rules of the road.)
Check and see if the local bike clubs or advocacy groups are holding the LAB "Road I" course or its equivalent in your community. This is an excellent way to get used to riding out on the road, whether on a road bike, mountain, bike, or whatever... and more than 2/3rds of the class focuses on time-in-the-saddle experience.

