The correct choice is Option 3: 'Going to the park with the new digital camera to photograph cherry blossoms.' The text states: '今週末は、このカメラを持って近くの公園へ満開の桜を撮りに行くつもりです' (This weekend, I plan to take this camera and go to a nearby park to take photos of the cherry blossoms in full bloom). Option 1 is wrong because the camera was already bought last week ('先週の誕生日に新しいデジタルカメラを買いました'). Option 2 is wrong because they plan to use the new camera ('このカメラを持って'), not a smartphone.