Having watched & worked with Kerry for a while, I largely fall here. That's not to say I dislike Kerry as a person, I don't.
Kerry's legislative record is strong on anti-conservation and not great on a lot of access issues outside of his personal crusades. He was a stalwart advocate for motorized use and has done a ton of work relative to trails funding for snow machines & ATV's.
He killed a bill in 2019 that would have created working groups to help improve state trust lands travel management
He authored a bill to remove public comment from wildlife management decisions unless you were a landowner.
He led the effort to transfer public lands in the House of Representatives in 2015 alongside Senator Jennifer Fielder
He voted against the pro-corner crossing bills
I'm sure there's a lot more he's been involved with, but those are just off the top of my head.
Having said that, he is a funny guy and he did run a decent committee as the chairman; tight, professional and no nonsense.