I can only say what I already am doing right now:

• searching for the interesting content (from the community view) and curating it throughout @tipu initiative
• upvoting posts that I personally find interesting with full upvote; it's not much yet way better than a 10% vote
• reblogging some posts
• keeping alive community areas like geocaching, running, mountains, @actifit, ...

There are more ways to be active, of course :)