Originally Posted by
wooljersey
My wife does not like to ride on the road and only enjoys moderate hills. Urban bike paths or Rails to Trails would be perfect. .
Tucson AZ has a 100 mile network of MUP called "The Loop" that is gorgeous, nicely-paved and well-maintained, mostly flat, and wide enough that it seems able to accommodate casual toodlers and diehard roadies trying to get their workout simultaneously. That's not a typo: one hundred miles.
The MUP around Quebec City in Canada is pretty nice too.
Frankly, the west side bike path (aka "The Greenway") in Manhattan (NYC) is surprisingly luxuriant as MUPs go, and if you rode it end to end from Inwood to Battery Park City and back you'd be clocking more than half of your 40 mile daily max. Just don't expect the luxury to continue if you swing around to the east side. Or the pavement even.