my favorite part of visiting acadia was experiencing the multitude of ecosystems and microsystems. life thrives on the huge slabs of granite in the ocean just as well as it does deep in the spruce-fir forest. lichens and mosses abound. highbush blueberries in bloom. but the birch trees took the cake. up north, they are stately and dominant. at times they are the sole hardwood growing among the spruce and fir. they command your attention.