Where should I eat and visit in the USA? (5 Feb 2010)

I need your help to eat!

There's nothing like good pre-planning before travelling, especially overseas, and I'm now trying to work out where all the best (and cheapest) places will be to eat at when I plan to visit the United States for the first time in October this year. I'm looking for good value and great tasting food as well as things I MUST see and do. I was inspired to do this post by My Food Trail whose getting ready for her travels in April to the USA so it will be great to see where she ends up visiting which will hopefully inspire me to add more places to my list. Unfortunately I'll only have about 3-4 weeks of time which I know is very short so that's why I want to find out what's the best of the best to update my list below before I go. So far the tentative travel spots, touristy things and food wish lists I've come across are:

San Francisco

• Crab aka Dungeness, Crab Louis-Tadich Grill

• Bi Rite Ice Creamery

• Whose Your Daddy Bacon Potato Chips

• Clam Chowder - Boudin Sourdough

• Alcatraz Island

• French/Vietnamese - Le Colonial

• The Stinking Rose

• Slanted Door - Vietnamese

Las Vegas

• Checking it out at night

• Spotting Elvis

• See a Cirque Du Soleil show?

Grand Canyon

• Maybe helicopter ride over it?

New York

• McDonald's – Big Mac Super Sized

• Sex and the City tour

• http://nymag.com/bestofny/food

• Mama's Food Shop

• Cafe Sabarsky

• David lebovitz New York City Dining

• Veniero's Pasticceria & Caffe - Cheesecake

• The High Line - Elevated Park

• Moss - Shop

• Two Boots - Pizza by the slice

Honolulu

• Halloween (31 Oct 2010)

• Luau

Food Search:

• http://www.zagat.com

I'd love to hear your thoughts on your favourite places to visit and eat in the United States which I should consider :-)