The shepherd's pie at O'Neill's is awesome. The place is pretty cool as well - it's in the basement of a historic building. The sushi place in town isn't bad either.
At Hayden you deplane on the runway so if it's cold that day, bundle up before getting off the plane. It's not a short walk to the terminal.
You can get a shuttle to the Grand but it's not super walkable to anything if you're wanting to leave the resort. Last time I was there, they had Uber/Lyft etc.
If you need rentals on anything run by ski haus and ask for Mata. Super nice dude and will actually take you on some pretty awesome lesser known runs if he's not working in the afternoon.
If you're taking anyone with you that needs lessons, ask for Robert (goes by Roberto). Younger guy with a beard that was great with our youngest for being her first time skiing. When she was 6.
Enjoy steamboat. It's a pretty great place.