1. Summer is hot, "too far to walk" depends on your own definition of how far you're willing to walk. Here in Shanghai, I'm down for walking from Nanjing East Road all the way to the other side of the inner city (hours of walking) in scorching sun. Others get bothered when they spend a few minutes in the sun.
2. If you want the experience of "shopping" you go in without a single clue. I would suggest you first go online through the DB and get an idea of which doors you want to knock on instead of wandering like a headless chicken.
3. Street food is a gamble if you're not used to eating it. However, for some people it's a gamble that's well worth it for the much lower price and much better flavor. Look around your neighborhood.
4. No idea here sorry
5. I would suggest you get a Cantonese coworker, ask him for his help, and then treat him/her to lunch. You'll definitely save more buying with help of your friend.
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