From the looks of the picture. It looks like you could use a new back tire. Maybe one with a little more tread.
Finished the day like this (water lapping up on the shore). And woke up to this: It really was a highlight of our trip.
I'm sitting in an hotel room just shy of 3,000 miles from my bike and this is the last shot I have available of it. There is a matching front tire I will install when I get home next. Plus a few more bits and pieces. If I can manage all the tasks in a day, I'll get to ride back to the valley of the blue-haired ninjas. Then I can go explore some more.