And I could wish my days to be Bound each to each by natural piety. (8-9)
The word "piety" makes us think of sacrifice and duty more than happiness, but the speaker is letting us know here that he would like his days to be filled with piety toward nature. We can imagine that he'd rather go sit in a grassy field than a hard, un-comfy church pew. If going for walks in the woods is his idea of duty, then this duty is probably a source of great happiness for him.