How about if you just sit down on the sidewalk, perhaps with a toy and let him explore the area on his leash, giving him the occasional treat. Like Justlittleoldme said, a little at a time, getting him used to a new area.
He is such a baby, I would typically spend walk time going where ever he wants to go. Eventually he will be up for an actual walk.
We used treats and it helped alot, at the beginning we also carried her a house or two down from our house and then she would walk. Eventually we didnt have to take her down the block alittle but continued to use the treats when she would stop walking, It took a couple weeks total, but now walking is her favorite thing. We go 3 times a day. I never thought she would get to this point the way it was going at first, so hang tight and be patient eventually she will enjoy it. We didnt start walking her until 12 weeks or so. It took a good 2 weeks to get her used to a colar and leash.
Little baby puppies can't walk far, and are reluctant to leave home (den instinct). Just pick him up and carry him. Assuming he's had two sets of shots (last shot about 2 weeks ago), occasionally put him down, let him explore, then carry him somewhere else. He'll walk soon enough.
Also, baby puppies get sore little paw pads, til they start to toughen. If paws are still pink then they'll get sore on rough ground in a hurry.