Start at Ubuntu, where you can pick up your stamp card. After enjoying some beverages and possibly a sporting event on one of their big screens, make sure you get your card stamped and turn left as you exit to walk down Street 27.
Note the location of the Sugar Palm Restaurant as you pass it on the left. It's well worth a visit for dinner during your stay, as it boasts a fabulous selection of local cuisine at very reasonable prices.
After cossing over Wat Bo Road, you'll find yourself at the river. Our next stop is pretty much directly ahead, but unless you fancy a swim, turn left and walk beside the river until you get to the Old Market Bridge.
Cross the brige and then turn right, then crossing over the road and walking past Sister Srey Cafe. Turn left down the alley next to the cafe and you'll stumble upon our second stop, The Welsh Consulate.

After enjoying the cosy atmosphere of the pub and, of course, getting your card stamped, head back out towards the river road and turn right, passing by the cafe again. Continue on, then cross over the road coming from the bridge. There are two footbridges just moments away. Take either of these across the river and you'll find yourself heading towards the Night Art Market. Turn right after crossing and both The Lost City Pizza and Embargo Craft Beer Bar are within a stone's throw of each other on the right.

Feel free to choose your own route, and bare in mind the following if you do:

Ubuntu have a few TVs so can put on a sporting event of your choice. They also serve great food.
The Welsh Consulate will also show sport, but if there's a popular rugby match scheduled, that's what will be on.
Lost City Pizza has superb food, not only pizza, but they also smoke their own meats.
Embargo has a large selection of craft beer from many breweries all over Cambodia.

Enjoy!