I don't think there can be a blanket statement about fun. No, this doesn't mean go and get drunk and skip church. What it does mean is that everything is different for everyone. What is fun to one person is mundane to another. What is a temptation to one person is something that another person doesn't think twice about. And if you see someone getting drunk, or having "too much fun," we cannot judge them. They may seem like the worst people on the earth, but we can never know their inner thoughts and struggles.
This reminds me about St.Paul's teaching on Christian liberty - conscience is a delicate thing; to the pure, all things are pure.
Seraphim