To second others, I think West Hartford or the west side of Hartford is your best bet. I recently moved my family to WH from the southern US and have found people to be very tolerant towards ethnic diversity and sexuality. The areas near the Center and on the border of WH and Hartford area fairly dense and urban-ish.

I wouldn’t consider anywhere around here to be incredibly diverse except Boston and NYC. That said, WH does have a sizable Asian community and is probably more diverse than the other places you mentioned.

There is no significant crime in any of those places you mentioned except Hartford. Not to say the crime rate is zero, but people in my neighborhood have no problems letting their children walk to school or the Center. We do the same. The west side of Hartford is pretty safe too as far as I can tell but you’ll want to check some stats on that.

One of the best things about here is you can go from being in an urban area to hiking trails in like a 15 minute drive. The rural areas have some interesting terrain and nice water features too. The further you go the more interesting it gets.

Agree with the other comments about CT not being past its prime. This is one of the oldest regions in the US and it is nestled between two world class cities. It makes sense that it is not some kind of boom town and thankfully so. There are political and financial challenges to be sure, but people tend to blow them out of proportion. Problems here are no worse than problems in other parts of the country.

Good luck!