Walking around Amsterdam takes longer than it should.
a) Because stoned
b) Because a) you're also lost and Amsterdam has a particularly incomprehensible layout that is baffling and long-winded when a) is true. This phenomena is x10 for first timers. Take a map (extra points if you take a lamintaed ACD map), or mobile data so you have Google maps. You'll need it.
c) Because most streets are lined with cobbles - so wear mountain boots if you intend to walk everywhere without ripping your soles and ankles to shreds. Seriously. I've had trips (and I know others here will attest to the same - I've seem their pain) where I've returned home crippled and blistered raw from the amount of miles walked on those cobbles in search of the holy high-grade.
Rent your bike from Starbikes near Central station - or Mikes Bikes (google for address).
Walking is however - BEAUTIFUL. And should be experienced for at least one day of your trip.
Trams are also great. You can hop on and off all day if you have a travelcard and all areas of the city are well covered.
In my opinion, cycling is the only way to get around Amsterdam for the intrepid Coffeeshop explorer.
The walk from Voyagers to Dampkring is perhaps 20-30 minutes if you walk slowly and know the route. But on a bike you'll be there in 3-5.
I used to walk. In fact - before forum member DLN coaxed me into cycling - I'd had ten or more trips hoofing around with blisters being dissapointed with my purchases because I'd walked 40 minutes across town, got lost twice and been met by an uninspiring menu or trays filled with shake and popcorn that I ended up buying from because I needed to sit down.
Now - if the wares are sub-par I can walk out and glide off to the next shop on my trusty two wheeled war horse.
ONWARD.

There is a big part of me that misses wandering around slowly taking in the sights. So definitely make sure you do that.
You're gonna have a blast. I'm very jealous - I so wish it could be my first time again. Magical.
Have fun. My top-tip would be to remember that the top-end of the menu prices wise doesn't neccessarily guarantee top-class flavour or potency, there are still plenty of gems to be found for under €10 if you really are willing to put the time and miles in to find them.