I'm a non dog owner and I wish dog owners would be more considerate. It's probably a case of the minority spoiling it for the majority - but dog poo in parks is beyond the pale. I'd give dog owners a warning and say if any poo is found then dogs are banned and see what happens.....
Another thing I'd like banned is the sheer number of lorries and vans going through the park. I've lost count of the times I've seen parents have to run and grab their kids as the rubbish lorry bursts through the gates. shame the deliveries have to come through the park.