Unfortunately, while I was delaying the start of the challenge, there was a charity auction held in Austin and all the giant painted guitars have been sold. So there is no chance to go and visit them now.
Also, I haven't gotten a huge number of ideas submitted for Austin Landmarks and Austin public art - and in many cases, it was hard to tell which of these categories a given item should fall in (e.g. Stevie Ray Vaughn statue on Ladybird Lake).
So I am consolidating. The challenge now reads:
In 38 hours, I will ride 38 miles per day and allong the way:
1. visit and photograph 38 Austin landmarks or examples of public art
2. Stop at 38 restaurants famous for their tacos and eat a taco at each one