Proposal puzzle box

How I asked my girl to marry me: She likes puzzles, so I made her a puzzle box. I invited her on a day out and came to pick her up early in the morning. I handed her the puzzle box and explained she had to solve the Sudoku-like puzzle on the bottom (it’s just rows and columns, not squares). Once she had finished the ’Sudoku’, she had the coordinates of the locations we were going to visit this day. We used a handheld GPS to find the locations. The first location was in a nature park with many animals. The