The phrase "most fun way" is correct and usable in written English.
You could use it to describe a situation that provides a great deal of enjoyment and amusement, such as "Playing tag with my family is the most fun way to spend time together."
Con Air sucks, but Con Air sucks in the most fun way possible.
"It wasn't the most fun way to drive but in the slippery conditions I had to do it.
The most fun way – and most Prada way – to do piping is when it looks like a six-year-old has taken a felt-tip pen to your outfit and outlined all the edges, from collars to pockets.
Sleeping Giant State Park, Hamden The most challenging and, arguably, most fun way to explore Sleeping Giant is to take the white-blazed trail out and return via the blue trail, a 5.4-mile circuit that repeatedly drops into shady gorges and crests at cedar-swept vistas.
"This helps us spend more energy on creating experiences that make Yahoo the most fun way to spend your time".
And iOS was the most fun way to play casual games on the go, not usurp dedicated gaming consoles.
Mini golf and bumper bowling are one of the most fun ways to save money this Valentine's Day while sharing lots of laughs.
You can do this in the most fun ways!
Cursing is probably one of the simplest (and one of the most fun) ways to get blocked on dizzywood.
Tie guan yin, the best known Chinese oolong tea, can be translated as "iron goddess of mercy", an appropriate name given that the most-fun way to reach the Hongmuwu Tea House high in the wooded hills above Taipei, is via a 4km cable-car ride that tops 300m at its highest point.
She's very provocative, hilariously witty, all in the most fun, warm way.
