Hi Beth. Thanks for the suggestions. My friend, who is much older, although more experienced cyclist, did this ride a few weeks ago. She knows where there are "port-a-pottys" around the island. There are cafes, although I doubt they want cyclists to just stop in to pee! There are convenient "stopping spots" with tables, etc. Definitely will check the weather prior to departing. I have to drive a ways to get there, so want to be prepared.
We will be cycling a ride called the PetalPedal in June and we've chosen the 30 mile route, so in part, this is practice. Our goal is not to go our fastest, but just to do it and have a good time and take in the scenery.