Swing Swing Swingin'

The weather the last week or so has been fairly decent so, we took advantage of a nice sunny day last Monday with a walk around the neighborhood and a trip to Commercial Park, just a few blocks from our house. As this was the first time to the park with Ethan, I think Matt and I were a little overwhelmed with the number of children running around, strollers, and mommies! Ethan, on the other hand, really enjoyed his first time on the swings. He had several belly laughs as he went back and forth and thought the "big" kids running around were really entertaining. One thing Matt and I were wondering; is there such thing as park etiquette? We walked past Wicker Park twice to swing and they were full both times. Luckily the swings at Commercial Park were open, but is there some sort of time limit to be followed, do you just wait in line? Oh, life as a novice park-goer!