If one was to take some of the public buildings in town that currently have flat roofs, and build a rooftop garden or park filled with native flora, it would add a much needed public space downtown. Studies have also shown that rooftop gardens in urban districts lead to cooling the area, and if we use all native flora, it would help support the local environment by maintaining species from the area.

See this article and video for reference:
http://ehp03.niehs.nih.gov/article/info%3Adoi%2F10.1289%2Fehp.110-a668a
http://www.youtube.com/watch?v=XxqdPOUoJ90