Breakfast: Having the baked things done ahead of time. Either things that I've frozen or just baking the night before. Fixing anything with the fruit that can be prepped. Setting the table the night before (I've been closing off the dining room at night right before I do this.) Shopping for bulk items, dividing into portions for 2-4 people and freezing (like bacon, sausage, Canadian bacon).
Laundry: Staying on top of the laundry!!!
Guest amenities/doodads: Picking things up when I see them at the dollar store, or discount stores. Especially cards for special occasions or turndown stuff.
Office work: I'm behind on this mostly because of not getting the space set up. I've actually blocked out a couple of days next week to get it done!!
Cleaning: Cleaning caddy that goes with me to the rooms that is fully stocked, including scissors, pen/notepad, screwdrivers, and anything else that I might need. It helps that I have a housekeeping/linen closet upstairs in the Main House & another one in the laundry room of the 2nd house.
You probably do most of this stuff already!