How about feeding the birds during winter season? I see no reason why not, do you? We could buy a huge bag of seeds from the feed bin for their best price, $25, find a sealable container (I am thinking for example of a Coca Cola barrel they used to give away) and place it somewhere central in the park like near the table and chairs.
Having watched Animal Planet of late, I also think it would be nice to have something like an obstacle course for our dogs to be challenged and stimulated by. Maybe a barrel to crawl through, ropes to jump over, big logs to balance on.
I am not an expert, but I always like to find things to entertain and stimulate my dogs, what do you think? And most importantly what might you be willing to contribute?