I've asked about a nice idea for my travel to Aardvark, and they recommend me this website. Mygola.  

They charge $30 for each trip. A trip is limited to a destination, and the first question is totally free. So I tried to ask good places in San Francisco, and the quality of the answer was really great. Here is the answer.

So I'll probably pay the money, and ask many things about other cities too. I'll keep posted about the result.