ThanQ  LaureKancha , fortune faded for so much of valuable information, I am going to print out all this so that i can carry with myself.
I am not a huge fan of indian food..but i will definietly eat maxican, nepalese food while m there.

I am still confused about south/north rim..etc for grand canyon. which one will be the best pick. i saw few day trip but dont' know which one to pick ..

Since Tips is not so common here  i have no idea on tipping in USA can you please tell me more about it, who should i tip? how much should i tip ?
heard i have to tip every where i go.. tour guide, hair dresser..fast food ..obiviously resturant..where else and how much

 how is ppl in general in VEGAS, LA ?  are they approachable ..anything i should know when dealing with ppl, things i should avoid.

I really appreciate all of you for the information.

But is there anyone that can provide me more of the info on LA. & SAN FRANSICO