This'll slow you down and you can still have fun. I'm getting one. When the time is right.
http://powersports.honda.com/2019/grom.aspx
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Some guy around the corner rides a Kawasaki Z125. It's surprising how loud a 150cc is with a muffler change. Decent growl too.
Groms have been tempting me for some time now. Have a buddy who has one, he keeps offering to let me take it for a ride but that may hit the old wallet a little more than I need. I got ride of my 05 CBR1000RR Repsol but still have a stagnant 91 ST1100 in the garage, I don't know if/when I'll ever get that one roadworthy again. My neighbor across the street just picked one up a few weeks ago, but I think it would cost more than it's worth to get it safely rolling again. Plus, it's a pretty complex bike with its V4, shaft drive, etc. For a lot less I could pick up a Grom and have a fun toy to putt around on.
The one thing I learned with the liter-class bike is that it's no fun driving a fast bike slow, but riding a slow bike fast is a blast!