We all hope to someday retire. Not to just have the freedom to sit around and do nothing, though; instead, we hope to have the freedom to do more of what we want to do and less of what we have to do.

Sound like a happy retirement? Of course it does.

But that kind of freedom comes with a price, right? Won't you need millions in assets and hundreds of thousands of dollars of annual income?

Nope. In order to rank among the happiest retirees you'll probably need a lot less in assets and income than you think.

When Wes Moss, host of Money Matters and a Barron's 2014 Top Financial Advisor, wrote his book You Can Retire Sooner Than You Think, he analyzed reams of data to identify some of the behaviors and characteristics of the happiest retirees.

While the traits he lists aren't intended to serve as a checklist--after all, we're all individuals--they can help you map out what you might need, both financially and emotionally, to increase your chances of being happy when you retire.

Here's a sampling of those traits and behaviors:

1. Happy retirees averaged $97,000 in household income during their "peak" earning years.

Unhappy retirees averaged $77,000.

Granted that's a fairly high income, but then again it's "household," not just one person. And clearly a seven-figure income isn't a prerequisite.

2. Happy retirees average $82,000 in "current" household income.

Here's where it gets even more interesting. People who say they are "unhappy" average approximately $42,000 in retirement income; those who are "slightly happy" average $60,000. "Moderately happy" retirees average $72,000, and "very happy" retirees average just over $80,000.

So what does it take to be an "extremely happy" retiree? They average $90,000 in household retirement income. (Again not chump change, but household, not per capita.)

Happiness levels quickly plateau; the difference between being "moderately happy" and "very happy" is only $8,000 a year; the difference between "very happy" and "extremely happy" is only $10,000 a year.

Greater levels of income, while certainly nice, still result in rapidly diminishing returns, at least where happiness is concerned.

3. Happy retirees have at least $500,000 in liquid net worth.

Of course those funds create a cushion (as well as generating income) but Wes feels there is a "psychological comfort" that comes from having a $500,000 safety net.

Interestingly, "moderately happy" retirees have right at $500,000 in liquid assets, but "very happy" and "extremely happy" retirees both report having significantly less than $600,000. More is better... but only by very small degrees.

4. Happy retirees own homes averaging $300,000.

A palatial estate may be nice... but it's not required.

5. Happy retirees don't have a mortgage... or are about to pay off their mortgage.

Happiness levels go up as mortgage balances go down. Not having a mortgage payment is not just liberating but owning your home outright provides a real sense of comfort and security. (And it frees up funds to be used for other purposes.)

6. Happy retirees have two or three sources of retirement income.

Proceeds from the sale of a business, Social Security, 401(k)s and IRAs, pensions from old jobs, investment income, part-time jobs... there are a number of potential retirement income sources. And the happiest retirees tend to have more income sources (not necessarily more income, but more income sources) than unhappy retirees.

After all, having your eggs in one basket means you worry a lot about that basket... and worry breeds unhappiness.

7. Happy retirees have a well-defined understanding of their purpose in life.

Direction and meaning in life correlates strongly with happiness. 91% of happy retirees are either "very" or "extremely" comfortable with their sense of purpose. 89% of unhappy retirees are either "slightly" or "not" comfortable with their sense of purpose.

Bottom line: happy retirees know what their money is for.

8. Happy retirees have at least 3.5 core pursuits.

What is a core pursuit? An activity and interest you love to pursue. Core pursuits are fulfilling and gratifying: volunteering, traveling, teaching, sports... things that make you feel good about yourself and your life.

9. Happy retirees live in the city or suburbs.

37% of unhappy retirees define where they live as "rural," which is almost double the national average (only 16% of Americans live in rural areas.)

Why does where you live make a difference? Cities and suburbs have more people, meaning more opportunities to engage and interact with more people.

10. Happy retirees take at least two vacations each year.

And they spend more on those vacations than unhappy retirees.

This is one instance where spending more money correlates to happiness, possible because travel is exciting and personally enriching. And travel is to some degree social, too.

Bottom line: to be happy in retirement you don't need a ton of assets. Or a huge annual income. Or a big house. Those things are nice, but they won't make you happier.

You need enough to provide a sense of security... but after that it's what you do with your time--not your money--that will make you happy during retirement.

Which, if you think about it, is just as true now as it will be then.