Tom,

This work is fabulous and goes great with all the previous blocks. I know your looking at a small town little citybut how about a small zoo that would ajoin the park. Nothing huge just a small one. Where I live we have a small zoo next to a park that has a band shell thats just beautiful and the right size for a small city block.

http://www.johnballzoosociety.org/attractions.php
http://www.youtube.com/watch?v=wez91ti9jXI&feature=related
http://www.mlive.com/grpress/video/flash/index.ssf?20070818zoo_video
http://www.johnballzoosociety.org/images/map-summer.jpg

You might check these links out for inspiration of course I know its an undertaking but I think if you downsize it a bit  you'll be able to incorporate it into a park setting block. You also have my vote on a Baseball field with the park, and a small pond for fishing...:)

Rich