The last time I went to the zoo was when I moved to the county where Mondays were free. I had always loved going to the zoo, but this time it impacted me far worse, especially certain areas. Our zoo does pretty well with education and conservation than most I guess, but my attitude really ruined the day for the people I was with, and quite frankly, I regretted that. I could have, and should have either thought better of it first, or looked at the better side and discussed how I felt about it later.
For every time you need to do or use something someone was exploited for do some form of advocacy as a kind of amends. You can write letters to congress and senate, participate in a protest, drop leaflets at strategic places.