Choose a Shanghai-to-Hangzhou day trip if you want a focused visit to West Lake and prefer returning to the same hotel. Stay overnight if you want the lake without watching the return train, or if tea-growing villages and another part of Hangzhou matter to you.

I'd make that decision before booking the train. The rail journey is only part of the day: there is also your Shanghai hotel-to-station trip, arrival transfer, walking, meals and the journey back to the station. A fast train does not turn every part of Hangzhou into a quick stop.

What fits a day trip

Build the outing around one lakeside route, lunch and the return journey. The Broken Bridge–Bai Causeway walking plan gives the day a clear beginning and a place to stop without committing to the whole lake.

Bai Causeway (白堤), Su Causeway (苏堤) and Gushan (孤山) are part of West Lake's landscape. It is a collection of places to explore, rather than a single attraction that you finish at an entrance gate.

I'd pick the lake over a long list of distant additions for a first day trip. If the main reason for coming is tea, make the tea outing the focus instead and treat a brief lake stop as optional. If a particular museum or temple matters most, plan around its confirmed visit arrangements and shorten the walking.

Avoid buying a return so tight that lunch becomes something to skip. Equally, don't automatically choose the final service of the evening. Find a departure that gives you a day you will enjoy and a return you are comfortable managing.

What an overnight stay changes

An overnight stay makes sense when you want to spend an evening in Hangzhou, walk again the next morning or separate the lake from another outing. Choose a hotel by the part of the city you intend to use; the word “Hangzhou” on a listing does not locate it near the lake.

I'd consider the extra night worthwhile for a trip centered on walking, food and tea. You can stop for a meal without making every decision against a train departure, and choose which outing suits the next day's conditions.

The extra night also means handling luggage, checking in and paying for another room. If your Shanghai hotel is already booked, compare keeping it with checking out and moving the bags. Don't count a hotel change as effortless merely because the cities are connected by rail.

For an onward journey, compare leaving from Hangzhou with returning to Shanghai first. Use your actual transport options and booking conditions. Sometimes returning to the familiar hotel is the easier choice; sometimes it creates a journey you do not need.

Read the station names in full

Use China Railway's English search for the actual origin, destination and date. Compare the full stations on each result, not only the city names.

Save the station names as they appear on the confirmation. Search with the Chinese versions when comparing the station-to-hotel route: 上海虹桥 for Shanghai Hongqiao, and 杭州东 for Hangzhou East if those are the stations on your selected journey. Other services may use different stations; use the ticket you buy as the final reference.

When comparing train options, check which one leaves you with a sensible arrival and return transfer. A modest difference in the quoted rail journey is not worth much if it makes the last stretch to your hotel awkward.

Keep passenger information consistent with the document used for the reservation and read the provider's confirmation. For the station process, use the rail travel guide before departure rather than learning it while carrying luggage through an unfamiliar terminal.

A useful comparison before booking

A useful comparison before booking
Your planI'd lean towardThe reason
A first look at West Lake, with the same Shanghai hotelDay tripYou can keep the outing focused and avoid moving luggage
Lake walking plus a separate tea outingOvernightThe activities do not have to compete for one day
Evening meal and another lakeside walk next morningOvernightThe extra stay is part of the experience
A full Shanghai schedule with one available excursion dayFocused day tripChoose a single reason to go
Hangzhou followed by another destinationCompare an overnight onward routeReturning to Shanghai may add an unnecessary leg

Use the weather to choose the activities

For a day trip, keep one indoor or meal option near your intended lake route. If walking conditions are poor, switch the order rather than race between distant backup attractions. If the forecast makes the main experience unappealing and your bookings allow changes, consider moving the excursion.

For an overnight stay, give the better walking conditions to the lake and the other period to the outing you can manage more comfortably. Confirm the details of a tea experience or indoor visit directly instead of assuming it operates in any weather.

An extra night gives flexibility, but it does not make every combination sensible. I would still separate a long lake walk from a busy sequence of other visits. Leave enough energy to enjoy the reason you came.

Before the train leaves Shanghai

Save the return confirmation, your arrival transfer plan and the Chinese name of the first destination. Decide what will happen to your luggage. Put the train details somewhere you can open offline, and share them if companions may separate during the day.

For a day trip, the satisfying version is simple: arrive, enjoy a chosen part of the lake, eat well and get back comfortably. Stay overnight when the evening and next morning add something you actually want. Let that experience decide the ticket, rather than booking first and trying to fill every gap afterward.