sequoia sempervirens forests redwoods creeks united states america travel tourist destination destinations virgin old growth location locations trail trails path pathway monuments parks san francisco bay area larry ulrich entrance to muir woods national monument marin county california winter snow snowfall trees redwood pacific dedicated groves world heritage site sites paths signs strength ancient forest nature walks interpretive sign and coast lady bird johnson grove park humboldt tree rhododendrons macrophyllum foggy misty spring flowers purity balance ferns portrait inviting hiking western rhododendron & hike mist northwest bridge bridges footbridge footbridges miner's ridge prairie creek state diversity lush walkway walkways over tropical hawaiian warm waterfall waterfalls vacation attraction attractions family londie g. padelsky akaka falls island of hawaii