The City & County are enhancing biking & walking along the Pantano Wash with the construction of a major extension to Pantano River Park. This project is due to be complete by December. Here's the most recent news article about the scope: http://azstarnet.com/news/local/article_ae35ef1f-aa7d-541f-afdc-c0e4fc9a1135.html
I particularly love that they have included a Tree Memorial Park where you can purchase a tree in someone's honor. Really nice.