Thanks to everyone who responded, your tips were a great help.
How did our day on Lopez go? Well, we did manage to actually get over to the island, and its really picturesque. I loved the lavender, I could smell it quite a ways away. However DH and I are not great at getting organized and moving in the morning, and you definitely need to get over to Lopez before noon. We just missed the 1030 ferry, and the next ferry didn't leave until around 1220 (delayed due to fog) so we didn't actually get onto Lopez Island till around 1330. We started heading into the village area, but then realized our plan of taking the 1800 ferry back was not going to work out. We were staying at Washington State Park, and had ridden our bikes down to the ferry, taking the 1800 ferry back would of ment riding back to our campsite in the dark. Neither bike has any lights. Considering the road back to the park is fairly busy and the fog was rolling back in it just made sense to cut the trip to Lopez short and head back during daylight. Lessons learnt, both bikes are getting front and back lights, and DH and I just need to bite the bullet and get our a$$e$ moving sooner in the morning. Our next trip we shall be more organized!. However in our bumbling around the next day we stumbled upon a real gem Guemes Island! What a great place to ride a bike! We spent a day riding all over Guemes. Not much on the island other than homes and the odd store but its a really peaceful place to ride a bike. If you get the chance check it out