sorry there isn't a general forum for USA but just review the VWP and basically looking to extend my 90 days into perhaps 110 days travelling in USA. I would like to see canada as well too but not sure if going to canada means this doing count towards the 90 days.
I saw this from another post;
Q: If I apply for admission under the Visa Waiver Program, can I make a side trip to Canada, Mexico, or adjacent islands?
A: Yes, you may travel to Canada, Mexico (contiguous territory), or the adjacent islands as part of your trip to the United States under the Visa Waiver Program and be admitted for the balance of your original admission period. However, if you are applying for another 90-day period you must meet all of the requirements of the program
I was thinking of doing a trip from August to November so the 3 months but would like to stay for a bit to try the snowboarding in december.
hope you can help