Do you want to camp in RV parks with full hookups or do you like more natural settings? If you're at least 62 years old you'll qualify for a federal senior pass.
http://www.nps.gov/findapark/passes.htm[url=]
The pass gives you free admission to federal parks and 1/2 price camping at most federal campgrounds. This includes Corp of Engineer parks which often have electric hookups and are usually scenic with roomy sites.
http://www.recreation.gov/campgroundDirectoryListByAgencyID.do?contractCode=NRSO&agencyID=70902 National park and national forest campgrounds are also 1/2 price.
http://www.nps.gov/findapark/index.Htmhttp://www.fs.fed.us/locatormap/