Hello everyone. Just bought a Trek navigator last week. The kid at the LBO said it's a geezer bike I don't care though, I'm in love with the thing! I rode 13 miles easily on a trail and plan lots more, but I have questions. Any rhyme or reason to how fast you increase miles? Also, I'm on the trail alone usually, though there are other riders when I go (just after dinner). Not to be a sissy, but does anyone have safety tips for a gal alone on a trail? Thanks, Clueless near Cleveland.