somniloquence

You cannot go wrong with Mary Oliver. All nature, all the time and magnificent, always.
Billy Collins. Very accessible but great stuff. Start with his early stuff, Picnic Lightning, Questions about Angels, Art of Drowning, Sailing Alone Around the Room.
Margaret Atwood
Ted Kooser - writes a lot about nature, wrote a book with a friend on their morning walks.

Some others - WS Merwin (can be obscure, for some reason he resonates with me), Phillip Levine, Lucia Perillo, Naomi Shihab Nye, Kenneth Rexroth (& his Chinese & Japanese translations).

I have a bunch of individual poems that I've found that I love on my work computer. I can send them/some to you if you'd like.

I also have a lot of Oliver's, Collins's, Kooser's, and Merwin's books & some great anthologies if you'd like to borrow.