I use Google Maps to plan out routes. The bike directions aren't perfect by any means, but they're a lot better than just "I think I'll head south west, and hopefully end up where I'm going." My buddy and I rode 30ish miles to our respective girlfriend's houses (odd that he and I live 2ish miles away and have girlfriends that are a mile apart from each other at that distance, but there you have it) and I printed out the turn by turn directions for the 13 or so miles we had to ride streets until we got to the hike and bike. Next time I'm copying those directions onto cue cards or something, and maybe second guessing some of the route, but the directions were pretty good.