Some choose retirement, and some have retirement thrust upon them. When it comes to figuring what to do with the decades of free time facing modern retirees, retirement coach Steve Lesser of Delta Advisors suggests taking inventory of what you find most important, whether it be leisure, socializing, contributing to a community or cause, or pursuing hobbies. Work also may be the most important thing, either for the income or for the sense of identity. More than half of people over 60 say they will work after retirement, according to a CareerBuilder survey. Here are 50 ideas for retirees deciding what to do with their days.