we are tow adults and are looking for tour to USA, What are the available option?

I'm not sure what you are looking for. Do you want to tour New York, Orlando (Disney), Los Angeles (Hollywood)?

Do you have any interests? What are your ages? How long? Do you want to do a "drive by shooting" (one day in each place).

Give us a little help with your interests? Water sports? Hiking? The USA is pretty big.

Budman is so right. I just want to add more questions. What time of the year? What is your budget? How much per day are you planning on spending including accommodations and meals? Where are you flying to? New York or San Francisco? Do you really want to travel with a group? As you may noticed majority of the posters here are independent travelers. If you are willing to travel on your own you are going to be surprised how much help and ideas you get on this board.

Check out tours of the National Parks in Nevada, Utah, and Wyoming which include a stop in Las Vegas. Before or after your tour, spend time in San Franciso and rent a car for the drive down Highway 1 to Santa Monica. Have fun.

Talk to a local travel agent about tours from your area. Usually you can get better prices on tour groups including airfare and hotel than doing it by yourself.

A travel agent also has several options for tours depending on what area of the US you are interested in seeing.

Again, not sure what you are looking for or where you are coming from.

I've been very pleased with Trafalgar Tours overseas. I'm sure their North American tours are just as good.

Here's their website:

http://ttcan.trafalgartours.com/us_frame.html

Click on tour search. "Western Frontier" sounds great.

There are many other tour companies if that is what you are thinking of.

I was on a Cosmos tour, and we had people from UK and Australia. Check cosmosvacation website if you're looking for a budget tour, Globus and Collette for 1st class, also there are so many others! Do a google search for "escorted bus tours" if this is what you're looking for.