Well Mr or Mrs cheese, lots of solid recommendations here from a lot of experienced bike travelers.
The only thing I'd add is that a reasonable coil lock is very handy because you can easily lock your bike to itself, through handle loops of your panniers, to a tree, to a picnic bench, whatever.
I always lock my bike in a campground and bring my bags in tent, both take seconds and your stuff is with you. It's a no brainer.
be observant and learn to assess.
have fun