Everything mentioned is walkable, including Sushi Den. Train to Pearl St. station, walk a couple blocks down. Boom. If there's something that doesn't appear walkable, Bcycle, train or free shuttle will get you there.
Walk up to Highlands for lots of other great restaurants and have cocktails at Williams and Graham or while you eat at Old Major or Linger. Little Man after.
Snooze is delicious but entirely overrated, so is Green Russell.
There are very few bad places and a million awesome ones, basically just walk around and find something that looks good.