A sense of humor.
This may sound glib and superficial but it does several things:
1) Stress reducer both yours and others around you.
2) Requires paying attention (if you aren't paying attention, you're going to miss a good joke opportunity and the snake you're about to step on).
3) Requires looking at things a little differently which opens up opportunities (the "hey that rock looks like my mother-in-law" may actually draw your attention to spring trickling out from under it)
I remember a Magnum PI episode where he was stranded out at sea and had a shark circling him. He gave the shark a name and talked to it (which to me watching the show as a adolescent was funny as hell).
I've used that tactic with my daughter for the "monsters under the bed" when she was little. I had her picture the monster wearing something funny ( a pink tu-tu), and make it clean up her room (that monster always did a lousy job at cleaning).
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peace,
samhain autumnwood