An action table -- lots of players in every hand, bigger pots -- is great if you are a tight aggressive smart player. A conservative table, full of rocks, is better (albeit less profitable) if you are looser -- you can grab a lot more pots with aggression but you need to remember to back off if the mouse plays hard.
Also, people will drop out as you play, and the nature of the table may change. Keep an eye on that, and switch up your play accordingly.
Most of the micros will have at least one loose-aggressive player, and at least one who likes to shove. Many of the people who will shove do wait for premium hands; some will shove because they saw it on TV and want to do it. And, hey, it's only a buck! But those bucks add up. So the micro tables can be pretty swingy. I'd advise not mixing it up until you get a handle on the others -- and call those shoves sparingly.
Some of those tables are, surprisingly, half full of sharks. Don't assume you will be the best player there.