[Water Warrior 2]

I'm an old guy and here it is what I would suggest. Half the fun is getting there so take your time. Ride at 60 and enjoy the scenery. Stop every hour for a 10 minute leg stretch and to get your blood flowing to all the body parts again. You will find the trip to be more enjoyable and relaxing. Take your time, take pics of the sights and give your gal a hug.
I may be a little conservative with the speed but I have found that speed isn't everything on a ride.
Oh yeah, take water with you for your breaks and don't forget to give the bike a quick look over the night before. Check the tires for 2 up pressure and be sure the oil level is up too.