What do you mean when you say 'tours'?
I didn't like taking tours (travel hipster lololoolol) but there are many out there, Sapa, Ha Long bay etc but you can do FAR better for yourself if you do NOT take tours.
In Vietnam, you will get a LOT OF PEOPLE offering tours and shit to you. Its just how it is. Shake your head and keep walking, and you'll be fine.
Down south they are more pushy.
Hanoi is great to just walk around in.
Tour people seem to love Sappa.
I skipped it and went to Ha Giang. There is nothing to do in Ha Giang, unless you really enjoy that fact in which case it is awesome.
Hire a motorbike (for like $3 a day) and go exploring. Try not to die.
There's towns up north along the China border which is where I went instead of Nappa. Google Dong Van (really, lol) But this is seriously way off the map.
Enough so that children who have never seen a white person before will start crying and lose their shit at the strange alien people.
However everyone else there is awesome. It's a big adventure, but it's of the unscripted kind. But you can walk into any hostel in Hanoi and say one word of English and get thrown enough tours that you will be there for fourty years doing tours of god knows what