I google spreadsheet every day and dived every day into three sections-morning, afternoon and evening. Each section has an activity block, food option and people as we often travel with friends and/or family.
I prefer one activity block a day and activities are typically scheduled by proximity. I also prefer packing sack lunches-hence the insulated lunch boxes that fit the kids' backpacks. If I'm staying more than a week, I plan the weeks out in themed blocks or I'm all over the place in terms of deciding what to do.
Here is a sample spreadsheet from our summers in San Francisco: