web, if you're looking for something for "fun", I suggest a good cardio kick-boxing class.
If you're looking for something for practical purposes, visit a few different schools and watch several classes. They shouldn't have a problem with that.
Look at what is taught, and just as importantly, HOW it is presented. And talk to some of the students.
Usually, a good Muay Thai school will provide both fun and practical application.
Spetz, re: your tagline -
(your tongue can move faster than your brain!)