How often do you want to do this route, and how much time can you realistically spend traveling it? If you can afford the time and if you're fit enough to ride 15 moderately hilly miles all at once, then you should do it. I don't think I'd want to commute 30 miles a day five days a week, but if this is a once-in-a-while type of trip, then yes, cycle it. You'll have fun and adventure and exercise, and you'll save money, too.