Once you stepped past the gate, you get a few excited dogs standing on their hind legs and vying to place their front paws on your legs, some of the other dogs will start sniffing you all over or licking your toes, while others will wait for their turn. As you walk through the enclosure, you will meet with more of them who will try that. The larger dogs won't place their paws on you, thankfully. There are so many dogs that I got my feet stepped on twice by them. Don't worry though, once they got use to you they will leave you more or less alone.
Best to visit in a large group and don't bring young children unless you can carry them in your arms all the time or let them sit on your shoulders. When they try to put their paws on you lift your knee up to block. When a lot of dogs crowd around you try not to show favour to any one and remain stern, they will eventually go back to minding their own business. Wear tough bottoms, and good walking shoes, don't wear your precious $100 top.
Somehow the pictures I took don't show enough dogs, so I took the one taken by Pauline instead :) If you allow them to sniff and lick your hands bear in mind they may have go sniff and lick another dog's ass a few moments ago :D