Harris: From maps.google.com the best route would be to circle the peninsula and cross over into northern New Brunswick, then head southwest from there. I used Percé and Philadelphia as starting and end points.
As far as the Gaspé, you can do it in a day or two or a week. Or a month. There's no shortage of places to stop. If you happen to be at Percé at low tide, you can walk out to the island.
An anecdote relating to the people there... in October, 2002 Marcia and I went around the east coast for our honeymoon. We stayed overnight in Ste. Anne des Monts at the top of the Gaspé and continued the next day. As we were driving around the southeast part of the peninsula, the brakes on our car began to make a wonderful grinding noise every time I pushed down on the pedal. Great fun when going up and down the mountains.
We finally pulled into Campbellton, NB and stopped at the Howard Johnson just over the bridge. Checked in, and although it was about 8:00 at night, I thought I'd call a local garage - expecting an answering machine message letting me know when they opened in the morning. The owner was still there, and when I explained our plight he said he was really busy but suggested another garage in town. I called them, and he was also there! I thought, 'Does nobody go home?' He was also busy but said if I brought the car in first thing he'd try to have a look at it. So at 7:45 the next morning we SLOWLY made our way the 300 yards or so to the garage and left the car. Headed back to the hotel, had some breakfast, and then, since we'd been on the road for several days already, loaded up our backpacks and walked off to find the laundromat.
In the middle of doing our laundry, a man from the hotel walked into the laundromat, said, "The garage called with a question about your car..." pulled out his cell phone and called the garage then gave me the phone. We hadn't told anyone where we were going, and Campbellton isn't THAT small! Our brakes were fixed and we were all set to go by noon or so, but we decided to stay another night in town. We sent a thank-you note back to the hotel for extraordinary service...
Mike.