Most visitors give Varanasi one night, and it is the standard mistake. It comes from reading the city as a sight rather than as a schedule. You land in the afternoon, watch the evening aarti from the crush at Dashashwamedh Ghat, take a boat at first light, and leave for the airport before the tea stalls have restocked, carrying the vague sense that something happened to you that you did not have time to understand.
The trouble is that Varanasi does not run on days. It runs on a split shift. The ghats face east across a long bend of the Ganges, so the sun lands on the stone stairs and the palace fronts at sunrise and has moved off them by mid-morning. The lanes of the old city are cool and working early, hot and half-shuttered by noon. Then the entire riverfront reassembles itself at dusk for the aarti. Between roughly late morning and late afternoon the city closes one eye, and that gap is what wrecks most itineraries: people try to sightsee through it and are worn out by the time the part that matters starts again.
Plan in shifts instead of days and the arithmetic gets simple. Three days is the honest minimum. Four is the number worth booking, because it is the first number that lets you see both Sarnath and the far bank without sacrificing a dawn. Five only if you intend to travel further out of the city. Two gets you one aarti, one boat and a headache.
Where to Base Yourself
There are two sensible choices and they produce different trips. Assi Ghat, at the southern end of the riverfront, is calmer, more open to the sky, and the one stretch of the ghats a vehicle can actually reach. It has the traveller and student cafe strip around it, including the long-running Pizzeria Vaatika Cafe just off the ghat, which is where most people end up when they want a table and a pot of tea rather than a lane. The central ghats around Dashashwamedh and Darbhanga put you inside the machine instead: you wake up in it, but you also haul your bag several hundred metres through lanes to get there, and the noise does not stop.
Varanasi is a cheap city to sleep in. A clean double in an old-city guesthouse typically runs somewhere around INR 800 to 2,500 a night outside festival weeks, and there are restored riverfront properties at many times that if you want one. Book the upper end well ahead for November and December.
Two Fixed Points That Set the Order
Before you assign anything to a day, note two constraints, because they decide the sequence more than your preferences do.
The archaeological museum at Sarnath, which holds the Lion Capital of Ashoka that India adopted as its national emblem, is closed on Fridays. The excavated ruins beside it stay open, but the museum is the reason to make the trip. So Sarnath never goes on a Friday.
Monday is Shiva's day, and Kashi Vishwanath draws its heaviest queues then. Thatheri Bazaar, the metalware market where a long-established kachori counter sits, traditionally shuts on Mondays as well. If your trip contains a Monday, that is your Sarnath day or your Ramnagar day. Keep the temple and the old-city food lanes for a Tuesday to Thursday morning.
Day One: Arrive, Walk South, Take the Aarti From the Water
Assume you arrive in the afternoon; most flights and the fast trains from Delhi and Lucknow land that way. Lal Bahadur Shastri International Airport sits at Babatpur, roughly 25 km out, and the transfer generally takes 45 to 75 minutes depending on how the city is behaving. Varanasi Junction, which everyone calls Cantt, and Banaras station, the renamed Manduadih, are both a few kilometres from the river. Godowlia is as close as most vehicles get to the central ghats; beyond it you walk.
Do not try to see anything on the first afternoon. Walk instead. From Assi Ghat head north along the water as far as your legs want to go: past Tulsi Ghat, the fort-like face of Chet Singh Ghat, the striped tower at Kedar Ghat, and the small cremation ground at Harishchandra, which most visitors never register because the famous one is further north. That stretch is roughly three kilometres of near-continuous stone and takes about an hour at a strolling pace with stops. It is the hour every later day hangs on, because it gives you the map.
Then the aarti. In the October to March window the evening ceremony at Dashashwamedh generally begins around dusk, commonly quoted at about six in the evening, though it shifts with the sunset by ten or fifteen minutes either way, so confirm on the day. If you want a place on the steps, be there roughly 45 minutes early. If you would rather see it properly, take a boat: the ceremony is staged towards the river and the priests face the water, so from a boat you get the whole line of platforms at once instead of the back of a crowd. Boatmen will find you. Agree the price and the duration before you sit down. There is also a smaller, quieter aarti at Assi Ghat at the same hour, which is the better choice on a second evening.