There is some space available next to the sand pit where a little house could go. I was at a playground recently with a playhouse and the kids loved it! I think it would make a good addition to the Pamela park playground. It could be a huge hit with the younger kids. It's very safe and can be built to last forever with the same type of materials as the rest of the playground.
Alternatively possibly some permanent sand toys in the pit could be fun.