What are the best day trips from Tokyo?

Kamakura over Nikko for a single day together. Kamakura sits 50 km south — JR Yokosuka Line from Tokyo Station, 920 yen one way, under an hour. Start at Hokokuji, the bamboo temple, before 9:30 while it's still cool and quiet enough that you can hear the stalks creaking in the wind. The matcha pavilion seats maybe eight people; the tea is bitter and grassy and the garden light filters green through the canopy. From there, walk the Kamakura hiking trails connecting the eastern temples — Zuisenji to Kenchoji takes about 90 minutes through cedar forest, steep in places but manageable. Skip the Great Buddha if you've seen photos; it's smaller than you expect and the crowd bottleneck at the entrance eats 30 minutes. Instead, end at Yuigahama Beach around 4 pm. The sand is coarse and grey-brown — this isn't a tropical beach — but the late-afternoon light on Sagami Bay is the kind that makes you both stop talking for a second. Pacific DRIVE-IN at the beach parking lot does decent fish tacos and local craft beer on a terrace overlooking the water. Last train back leaves Kamakura Station around 11 pm, so dinner is unhurried.

Hakone is the couples trip. The Odakyu Romance Car from Shinjuku takes 85 minutes and costs 2,330 yen including the limited-express surcharge — book the left side going out for the best river-gorge views as you drop into the valley. Buy the Hakone Free Pass (6,100 yen, two-day, but one day works fine) which covers the loop: train to Hakone-Yumoto, switchback railway up to Gora, cable car to Owakudani, ropeway down to Lake Ashi, pirate boat across, bus back. The Owakudani volcanic valley smells strongly of sulfur — rotten eggs, basically — and the black eggs cooked in the hot springs taste like regular hard-boiled eggs with a faintly mineral edge. Worth trying once. For the actual romantic part: book a private rotenburo session at Hakone Yuryo near Hakone-Yumoto station. Private rooms run about 4,500 yen per person for 60 minutes, and you're soaking in milky-white sulfur water with steam rising into the cedar trees. Skip Tenzan Tohji-kyo if you want privacy — it's a public bath complex and gets packed on weekends.

Nikko needs honesty. It's 140 km north, two hours by Tobu Railway limited express from Asakusa (2,800 yen each way), and the Toshogu shrine complex alone takes three hours to walk properly. You'll spend four hours on trains and five at the shrines, which leaves almost no slack. The carved cedar gate and the Yomeimon are extraordinary — gold leaf and lacquer in a density that feels almost aggressive against the dark cryptomeria forest behind it — but the site swarms with school groups between 10 am and 2 pm, and the noise makes it hard to appreciate the details. If one of you wants the shrines and the other would rather hike to Kegon Falls (another 45 minutes by bus from the shrine area), Nikko splits awkwardly: you'll spend more time reuniting than apart. My honest call — make Nikko an overnight and stay at a ryokan in Kinugawa Onsen, 30 minutes further up the line. As a single day from Tokyo, it's survivable but exhausting, and exhausting is the enemy of romantic.

For a lighter day, Enoshima is 65 km south — Odakyu to Katase-Enoshima, about 70 minutes, 630 yen. The island is small enough to walk in two hours: a steep path through shrine gates to a lighthouse with views of Sagami Bay and, on clear days, Fuji floating above the haze. The seafood restaurants at the base serve shirasu — tiny raw whitebait piled on rice, slippery and briny and weirdly addictive. Tobiccho near the bridge does the best version; arrive before noon or the raw shirasu sells out. Pair Enoshima with a morning in Kamakura since they're on the same rail line, 7 minutes apart. For Fuji itself: Kawaguchiko, 100 km west, two hours by highway bus from Shinjuku Bus Terminal (2,200 yen one way). Fuji visibility is unpredictable — maybe 40% of days you'll see the full cone, and mornings beat afternoons. The north shore has a walking path where the reflection shots happen, but only in dead-calm conditions. Don't build your whole day around one photo. If you take the JR Chuo Line back, Katsunuma wine valley is a 30-minute detour — Japanese Koshu white, bone-dry, and the tasting rooms are quiet on weekdays.