Did you think anything was lacking?
Not sure what you are using for shoes, but many of us use bike shoes that use SPD cleats that are easily attached or unattached from the pedals. And pedals that one side connects to SPD cleats, the other side is for use with regular shoes.
I like a handlebar bag, all my valuables are in it, and things like granola bars, my phone, multi-tool, etc. It goes in restaurants and grocery stores with me.
On roads I like a flashing taillight, but not needed on rail trails.
As noted above, fenders. On a wet day you will really appreciate them. The photo below was a friends bike on the GAP and C&O on a rainy day, this was the last tour he did without fenders.
