Depends on the visit, the weather, and whether I plan to return to the room mid-day to rest up for the evening. Usually, I try to take as little as possible. Less to carry, less to keep track of.
In the past I've carried a backpack, large and small fanny bags, a small "guide-book" sized bag, a string bag, and a couple of other bags of various sizes. I've also made heavy use of pockets on cargo shorts/pants.
In my pockets are my wallet (ID, cash, credit card) and a small paperback book to read at meals or while waiting for the bus or the family to show up somewhere, and a small flashlight, a small bottle of headache medicine, and my phone. I wear a hat, sunglasses with a strap so I can drape them off my neck, and a water bottle on a shoulder strap.
I may take a travel umbrella if it looks like rain, or a light windbreaker if it may become chilly. Since I like to go back to my room for a few hours in the late afternoon, these are two items that I can either take or leave as necessary. This is when I may take a small bag to carry them in.
I rarely take a camera. I took a camera to the parks is when I was doing the Keys to the Kingdom tour and watching the Star Wars parade, but otherwise it just takes up space and adds weight.