Yelp is a great app for getting local knowledge on where to eat, drink, and shop. You can easily find places nearby, read or add reviews and photos, and get directions,
Filters include price, distance, rating, most reviewed, and opening hours.
There are some cool features. With Monocle, you hold the phone in a certain direction and it displays restaurants in that area and Talk is a Q&A forum where people get and give advice.