Meditation has always done the opposite of ground me. Maybe I've never practiced it enough. I don't know. I always hallucinate worse when I do it. Anyways...

-Being in the woods, the mountains, at a lake, a pond, a swamp, somewhere in nature.
-Physical activity i.e. running, hiking, mtn biking, yoga, rock climbing, snowshoeing, (in the past) skiing,
-Playing piano/guitar/harmonica/trombone
-I'm a big scents person so candles/essential oils/stuff like boiling apples and cinnamon or bringing in some sappy pine cones.