There's An Alien In The Park in Bloomington, MN

An alien has landed and he is in the Earth park. He thinks the park is so grassy, so green, it’s one of the best places he has ever seen. OR IS IT?
What is that shadow on the path? Whose reflection is it in the water? And why is earth water so wet? Thankfully, his friend Dan and faithful dog Zack are there to help.