I'll use Hersheypark terms in here so that it's still "on topic". There should be no shame in riding Cocoa Cruiser if it's fun to them. You can still have good clean fun as an adult while still acting maturely, such as not hogging the front from some kids who waited a long time, waiting one ride if a group gets split up because of you, not being loud and yelling things like "they ruined our ride, they turned the trim on!", not filming anywhere near the ride, etc. I typically don't ride family coasters because I don't find them fun, but my younger brother who is also an adult likes to ride them for the credits, and I will shamelessly ride with him! Don't be embarrassed to enjoy life! Doing enjoyable things helps reduce stress and increases self-esteem.
One could question the creepiness of an adult at Hersheypark as a whole. After all, people might consider it a "children's candy park", but that shouldn't matter. Heck, Disney is even more of a place geared toward children and many adults go there because it is fun to them. Even if they are judged because of it, who cares? I think that it is more mature to be able to face the criticism and not let it ruin a way of having clean, G rated fun that does not harm anybody or break the law. Why should "adult" fun have to be R rated behavior that can be considered morally questionable and has the potential to harm yourself or others? Even the legal way of having "adult" fun is boring! Amusement parks are way more exciting than watching the news, discussing politics and the stock market, or betting money on football teams only to have it go to waste!
I do agree, there are people that are creepy, and it's unfortunate that they ruin it for people who are not looking to cause trouble, but that still shouldn't stop you from having fun at an amusement park. We all end up the same way eventually, and 100 years from now nobody will think we're a creep for riding family coasters.