As anyone who knows me can attest, I do not like the heat. Anything over 80 degrees feels uncomfortable; at 90 degrees I can barely function, so for me to plan on a 50 mile ride when the temperature was close to 90 and the humidity on the high side was very close to miraculous, but it had to be done. I leave for Seattle in two weeks. The next 3 days are forecast to be hot and humid. 
The plan was to get out early, at least by 7:00 so as not to have to bike at midday. Nice plan, but it just didn't materialize, although I was on my bike and on my way at 7:45. First stop the Hingham Library to return some books on CD.  Next stop Wompatuck State Park to refill my water bottle and use the facilities. Next, ride around Wompatuck through Hingham and Norwell. Mostly shady, which was nice, but also very windy roads with no shoulder. Followed the road into Scituate Harbor.  Stopped for breakfast around 10:00 at a place I had stopped before and the waitress remembered that I was biking X country.  They were so nice, making sure I had plenty of water. From there I retraced my route back to 3A and east to Kennedy Gardens.  Perfect. It's a large nursery, with bathroom, Poland Springs water bubblier, and a shady patio area with comfortable chairs where no one bothers you. I made myself at home. I thought it best not to bike between 11;00 and 1:00. After resting I had no problem killing some time exploring the many shrubs and perennials. 
Back on the bike, again riding through Scituate Harbor. Stop at Dunkin donuts for an iced coffee. It really does seem to give me an added boost.  Stop at the bike shop in Cohasset to buy a bike pump that can be attached to my bike and also to make arrangements for them to pack up my bike so I can take it with me on the plane. 
From there it's only 10 miles back to home. As soon as I get into Hull I can feel the difference in temperatures. There's a wonderful cool breeze. Not sure if it's coming from the bay or the ocean, but it feels great. And I've made my goal of biking 50 miles.