Often those retiring find that the amount of money they thought they'd need simply isn't enough to cover all the expenses. In this case, seeking part time employment not only adds to the social calendar, it also replenishes the budget.
If you're a retiree with special training, you can schedule your own time if you decide to start your own consulting firm. Those with management skills often find that offering services to struggling businesses can be profitable and pleasurable. You still get to use your expertise and feel the rush of accomplishment but often don't have the same pressures as you did when you worked for a company. If you want to refuse a job because vacation harkens, you can do that.
The world of real estate also can be a joy for the retiree. Retiring to a growing area often offers opportunities for sales positions or even development of real estate. Of course, if you want to sell real estate, you'll have to seek licensing, but the flexibility of the schedule and big rewards are often worth the price.
Sometimes retirees want more than just money; they want additional health coverage too. Health insurance is often one reason many people postpone retirement and seek employment for a supplement after retirement. In this case, finding a job as a greeter or cashier at a grocery or general merchandise mega-chain store might fit the bill. Often the pay is lower but it offers enough to purchase health insurance through the company and pocket some funds besides.
Do you have a special flair with words? Consider writing after retiring. Writers often don't make much at first, sometimes only a penny a word or less, but you don't have to dress up or leave the house for this occupation. There are a number of opportunities on the Internet and while the market is tougher to crack, national magazines and newspapers purchase freelance material. If you have technical knowledge, your prospects for income from writing after retirement are often better. Sharing your technical knowledge with others can provide a comfortable paycheck without requiring you to show up at an office or keep a 9 to 5 schedule.
Just because you're retiring, it doesn't mean you can't learn a new skill and make money from that skill. Classes at local universities and schools often include computer classes or even knowledge for hobbies such as gardening or crafts. If you find something you love, there are ways to make money from that. Consider retirement an opportunity to work in that field you always loved. From gardening and selling organic produce or flowers to setting up computer programs or online sites to reap advertising payments, there's opportunity everywhere to earn money without committing to full time work.