Just have a good walk around. Loads to see.
Rijksmuseum if you get there early, or, preferably, pre-book tickets for opening time – it gets packed there, if you do go, see the Vermeers/Dutch masters (all on one floor) first, as it’ll be packed on that floor by 11am. The rest of the place is tolerable, the crowds go to see the ‘big ones’, Vermeer, Rembrandt etc, but loads more there of a real quality.
The Grand Cafe on Platform 1 of Centraal Station, lovely room, great food and service, with a parakeet watching over you.
The flower market, see bulbs/flowers you’ve never seen before, then get stopped by customs on the way back as they think the Amaryllis bulb you’ve bought is drugs.
A walk around the red light district is probably a good idea, just so you know what it is like.
Canal tours are liked by some, never appealed to me, but may be your thing?
I like the streets to the West of the City centre(de Pijp?). Loads of places to look around and eat/drink.
We’ve been to the Hortus Botannicus twice.Nothing spectacular there, but it does have some rather large greenhouses, with desert conditions, so great on a cold day, along with a very humid indoor forest area.
Avoid the main street from the station if possible, full of tourists and tat shops.
