All of you have provided me with much food for thought. Thank you everyone for the comments. That's why I love this forum, because Kipawa is unique in that he is Kipawa, so even things disagreed upon may offer a clue to his behaviour and why he does something.
Kipawa LOVES the dog parks where these incidents happened, so for him, I am tending to think that there definitely is excitement involved, which could add to him wanting to pee, and yes, if an owner was around a dog he was hanging with, he might also pee on the human due to a small display of dominance. I also can see the validity and I do understand what some of you are saying, regarding peeing on the most upright thing, which could be a person.
What to do? I will watch him and be closer to him (may require me to do sprint training!) if I see him seeking out an area where people are just standing around. And Therese gave me an excellent idea - make sure he is 'peed out' before entering the park.
I can tell you that Kipawa and I have a very strong bond. He is with me wherever I go in the house, and when outside and off leash in a fenced park, he always looks back to see where I am. Of course, the bond can always grow. With this in mind, I am talking to another dog behaviour class. He passed his puppy class with flying colours, so it's time to continue with his learning process.
Again, thanks to everyone.