Plan

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: