How Long to Spend in Sapa?

Hey guys,

I've been having a little look around recently, and haven't really found a general consensus.

This is my current itinerary for Feb 1st onwards:

1st - Arrival in Hanoi
2nd - Hanoi
3rd - Hanoi (night train to Sapa)
4th - Sapa
5th - Sapa
6th - Sapa (night train to Hanoi)
7th - Hanoi
8th - Hanoi
9th-11th - Halong Bay Tour (to escape Tet closures elsewhere)

However, I've recently been hearing noises that perhaps 3 full days is a bit much in Sapa. We're all for trekking, for sure, but I don't want to get bored whilst we are out there! Our budget is rather small generally speaking, so we won't be able to necessarily get expensive guides or tours done (that's for Halong).

My Question is: Is there enough to do in Sapa to fill those 3 days (we won't be there for the market)?

Thanks on any feedback.