I am a Greek citizen; this means that I have the chance to travel with ESTA. I have already bought my plane ticket and I will be in San Fransisco for 46 days, taking my backpack and travelling by bus.
Will it be a problem travelling so long as a visitor? They won't regard me harshly for being 46 days as a tourist, will they?
Not at all. If you're getting the ESTA/VWP, it's valid for 90 days travel (there are some weird laws about exiting and coming back in, all has to be done within 90 days if you're doing Canada/Mexico as well), but 46 days is half that!
To have a smooth transition, you'll want to have proof of onward travel, address of your first few nights' accommodation if possible, and ideally a rough itinerary, and proof of funds, although those aren't always asked for. They'll likely question you to ensure your plan isn't unreasonable and that you've thought it through, but then you should be in and able to enjoy the country.
