A fireplace is a place of fire. 

A workplace is a place of work (well, that’s the theory. How much work do you get done there, really?)

A someplace is a place of... some... fun? Some thing? Some level of possibility and potential?

“I’m sure it’s someplace around here and I know I’ll get somewhere with this soon.”

‘Someplace’ and ‘somewhere’ are general.

‘Fulfilled’ and ‘in Tokyo’ are specific. 

Go specific, always.