Yes, Many campgrounds provide, and many of us are not real thrilled with the type of service the free stuff gives. Sometimes you need to be IN the office building to access. Sometimes not. Sometimes it is NOT free. Sometimes the free stuff works, sometimes.
Newer laptops have the wifi capability built in.
Many longtimers/fulltimers are going to Satellite or air cards for thier internet access.
Suggest reading lots of areas on the forum, this is discussed a lot, and ohhhhh, on that front page of the forum, look for the little yellow ARCHIVES button on the right side of the page. Lots of goodies buried in there!
'Nother suggestion, which is not totally off subject, consider using web based email accounts, yahoo, hotmail, AOL, gmail. That way if you can access the internet, you can access your email. All the ones I mentioned above have FREE accounts. Gmail gets some of the highest review reports. My hubby, who HATES typing and email, is happy and ok with gmail. Plus you can get free online storage for photos via gmail, easy to learn, easy to use, and FREE.