If you have it at Lloyd there is a park right across the street. So there would be a place to get food and a place to run around. I am not too sure if there is any food place by Washington memorial Park, other than the zoo, but it is a great place to take pictures.
With that being said it all depends on what you want to do. If you just want to hang out, play glomp circle and what not I would say lloyd. If you are looking to get pictures and hang out I would was Washington Park.
I probably wont be ale to do anything this weekend since I have work Friday, Saturday and probably Sunday. It depends on what time you hold it.