What's the point of even going to a park, if you don't want to have fun?
Blaming ride ops, weather conditions, trash, graffiti are just excuses by someone who probably is having an "off" day, and doesn't even realize it.
If the ride ops are alert and fun, it might make the day better, but if they're not fun, you shouldn't let it make your day bad. Sometimes it helps if "you" are more outgoing, by teasing, making eye contact, or some other thing that might make the ride ops day go better or faster. They don't have a choice of the people they have to meet all day, but you have the opportunity to make sure they don't think you're one of the jerks.
Trash happens. If trash bothers you, stop by the guest relations and make some "positive" suggestions. If they don't take you seriously (which they should), then let it go or call their office the next day you have a chance and try talking to someone that wants to make it right.
Remember, having a nice day is up to you.