I've not had opportunities for bike-centric travel either, but I've lived in a few places and picked up bikeshare bikes when out of town for work or taken bikes when visiting family.
Places I've ridden near where I lived:
- Southern California; mostly Orange County, excursions to LA and Riverside counties
- Denver, Colorado/Boulder, CO and areas in between the two
- Mobile, Alabama
- La Crosse, WI area, including west-central WI, southeast Minnesota, and northeast Iowa
Other places:
Kalamazoo, MI
Lincoln, NE
Seattle, WA
Orcas Island, WA
Vancouver, BC
London, UK
With any luck, I'll add to this list soon, either through work travel or moving someplace new!