The structure writes itself: two loops on the main island, one boat day, one day the weather owns. Fly in on the earliest Manila departure (cancellations cascade through the day), register at the tourism office, pay the small eco-fee, and hand your schedule to the sky with good grace.
Day 1: the North Batan loop
A tricycle, a rented bike or your own two feet: the loop is short and dense. Naidi Hills and the Basco lighthouse for orientation, the Vayang rolling hills for the green-waves photograph, Valugan boulder beach for the sound of a million stone eggs grinding in the swell, and the Japanese tunnel above Tukon for the war layer. Finish back on Naidi for sunset; the honesty shop on the way down sells the celebration drinks, notebook and cashbox style.
Day 2: the South Batan loop
The bigger, wilder half. Chawa viewpoint and the blow-hole cliffs, the hairpin road theatre at Alapad where buses honk before blind rock, the old stone church at Ivana (tomorrow's boat dock, scout it), and the day's centrepiece: Racuh a Payaman, Marlboro Country, where communal pasture pours off the ridge toward the lighthouse and the Pacific. Allow an unscheduled hour here; everyone needs it. Loop home through Imnajbu and the oldest chapel on the islands.
Book flights with a free day before your onward connections in Manila. Basco's planes respect fog, wind and typhoons in that order, and the stranded-traveller stories all start with "we had a tight connection". The buffer day, if unused, becomes a second Marlboro hour. Nobody has ever complained.
Day 3: Sabtang, the stone-village day
Dawn tricycle to Ivana port, the 6-7am faluwa across the strait (thirty honest minutes; sit centre, keep cameras bagged), register at the Sabtang tourism post and hire the waiting tricycle. The circuit: Savidug's stone-and-cogon lanes, the Chamantad-Tinyan viewpoint coves, Chavayan where the vakul headdress is still woven and worn, and the Morong beach arch for the lunch stop. Afternoon boat home, salt on everything, conversion complete.
Day 4: the weather's day
Three good fates. If seas are kind and your schedule loose, chase Itbayat: two-plus hours of open-ocean faluwa to the cliff-ringed island where boats dock against a wall and burial caves dot the jungle; plan to overnight, returns cancel freely. If not, re-run your favourite loop by bicycle, hike the lower flanks of Iraya, or do the finest thing Batanes offers: nothing, on a hill, with wind. The spare day's real job was always the flight insurance.
Money, food and manners
Bring cash: ATMs exist in Basco and have moods. Eat lunch as the main meal (kitchens close early), order turmeric rice, uved and flying fish at least once, and treat coconut crab as the occasional treat its conservation status suggests. Pay every honesty box with ceremony, greet everyone on the road because everyone will greet you, and leave gates as you found them; the cows have opinions about tourists who don't.
The itinerary, assembled
D0 first flight MNL-BSO, register, Naidi sunset · D1 North loop · D2 South loop, Marlboro hour · D3 Sabtang by dawn faluwa · D4 Itbayat gamble, bike day or glorious nothing · D5 fly out on the morning plane you booked with a buffer. Pack a windproof layer, sun cover, soft bag for the small plane, and the patience the Ivatan perfected centuries before tourism found them.