Rotterdam ( from amsterdam centraal - rotterdam centraal takes 45 mins or 1:12 depending which train u book,price with Price with e-ticket € 17,90 each way max if u travel before 10 am 12.53 euro after10 am), from rotterdam to amsterdam after 7 pm in the evnin its 14.32 euro pp (off peak hours) The price is based on travelling with an OV-chipcard. Book tickets using - https://www.ns.nl/en/journeyplanner
Also if u don want to walk all the way thru consider day pass for the city (a lot cheaper to buy a day pass for 9.50 EUR) or ov chipkarrt works
Vegan - Crave Bakery,
1 Centraal Station
2 Luchtsingel Bridge, the world's first crowdfunded bridge
3 Wander around the pretty courtyard at City Hall (Stadhuis Rotterdam)
4 ST. LAWRENCE CHURCH
5 Markthal ( Vegan options - tofu haven( some vegan options),55 bombay streetGoudstroop (stroopwafels chk if vegan- nothing on dier website)
6 c cube houses (Kijk-Kubus Museum-house) - by piet blom from 1983
7 TAKE IN THE BEAUTY OF THE WITTE HUIS (one of the few buildings that survived the extensive World War Two bombing.At the time of its construction, it was the tallest office building in Europe.)
8 Hang out in Witte de withstraat, Rotterdam's coolest street (Food - Frietboutique (fries n vegan options ), supermercado( some vegan options and 3 mins from the street,Happy Food and HealthVegan Junk Food Bar )
( consider public transport btw wihstraat and delfshaven since its a 30 min walk)
9 pretty neighborhood of Delfshaven
10 unusual shaped church that is Pauluskerk
11 Lijnbaan is the main shopping street in Rotterdam
Back to rotterdam centraal . Try and see if u can spot the erasmusbridge from anywhere
Other food options Vegan -
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( some vegan options)