Visiting America...

Hello all. In August I am going to Boston for a photo shoot and my client has offered to extend my flight ticket so that I can travel back whenever I like. This will be my first trip to America. I was thinking of spending four or five days in New York and then four or five days somewhere else. What can you guys recommend? Yosemite is the place that is in the forefront of my mind, what do you think? Any advice, tips or tricks would be much appreciated.

Thanks