I can honestly say that I didn't plan to retire at 55. 20+ years ago, I wan't even thinking about retirement until AT&T told those eligible (I had 30+ years) that they'd add a year's salary to the retirement $$$ if we left early. I turned 55 in the Spring, saw the offer, talked with my better half and I was gone in December. I took the cash instead of the company's monthly dole and I found someone to manage it. Of all the companies I contacted, the response was "We'll see you in our office on " except for one guy who said "Where can I meet you?" and came to my work location at lunch. Can you guess which one's still managing my IRA? The outlook varies by company and person, as other people in his company didn't all have that outlook. Now might be the time to look for a financial advisor.
What would make you happy, pleased or give you a little smile if it was your choice of things to do tomorrow - and you didn't have to set the alarm clock? You're the only one who can answer that, although you might know a person or two who knows you well enough to say "You've always talked about ....."
My plans then? Go back to college and finish the degree I never quite had time to finish before (working odd hours, some traveling, etc).
Did the plans work out? Better than I expected ;-) I'd no sooner gotten registered at the university than another department of the former company called and asked if I'd do some work on a contract basis. The manager I'd be working for was willing to do flexible hours so I could still be in class (nice to be wanted ;-).
That lasted a year or so (at similar or better take home) and then the company got rid of ALL contractors (not an intelligent move, but corporate wasn't always intelligent). While we had other income sources, the company that handled the paperwork for AT&T contractors wanted me to be their laptop & printer depot for their far-flung mobile workforce (international consulting company). I did that for a couple of years and then a friend asked if I could be the go-between to translate military subject matter expert (SME) words into computerese. Did that for a year or two until personnel problems in that company lost the military contract. I was terminated so a friend of the manager could be full time "because she has a child" - that doesn't work when the person coming into the job is knowledgeable of neither the project nor the languages being used.
Eventually, I reached the age of "Must take from your IRA" and since then I've been exploring things of interest - built a solar-charged generator for the frequent power outages we have so I'm not out in the dark, a thunderstorm or 7 inches of snow to start a gas generator. I've also started writing some post apocalyptic world (PAW) fiction and have published one book that's sold 1700 copies so far - not bad in a niche market. It's listed in the "Creative ERs" section.