Start gently with a Japanese breakfast set or a kawaba-style coffee at a local kissaten to adjust to time zone and sample simple tamago, rice and miso soup.
Historic Senso-ji is Tokyo's oldest temple; stroll Nakamise shopping street for snacks and souvenirs. Great for first-day sightseeing; temple grounds open from dawn to dusk (shops ~9:00am).
Take the bus up the mountain to scenic Lake Chuzenji and Kegon Falls; seasonal leaves or summer greenery make for great photos. Bus services vary seasonally—check schedule.
Choose immersive digital art at TeamLab or modern exhibitions atop Roppongi Hills at Mori; both highlight contemporary art and are popular—book tickets.