Providers and hobbyists...
When you go out of town...which city do you most prefer to go ?

providers, do you also provider services in those cities ?

I would assume New York, LA, Vegas are the most visited places.

Which city would you recommend I visit - to seek nice providers ?

Stay dry

Atlanta has a bunch of excellent providers at reasonable rates.  NY and Vegas are the most expensive cities to hobby in.

The cities you have listed are very popular cities in our country but at the same time those cities have so many choices, bait & switches that you just never know.. Say you were to visit a semi big city, yet still small enough that the variety is there but its not over loaded with options & different rates..
Take Milwaukee, my hometown for an example.. It's a big enough city to find activities such as art museums, water shows, rock climbing & beautiful site seeing. The providers that come along with a smaller city can actually be easier to find what your looking for. Everyone knows what they want & like, so doing a simple search could help your search vs. searching in a huge metro city & having many issues like, parking, donations for time (( every city has a different "going rate"))  
That being said, IMHO if I were newer to this & travel a lot, I would start with the smaller cities.  
I do hope your travels goes safely for you & I wish you happy hunting.

Be naughty & stay safe.

Xo  
Lynn Fairview

...so when I went to DC in May, I had a fantastic time!

I prefer going places that are easy to navigate and bike/public transit friendly. That's not everywhere..  

I had a great time in Cleveland (full disclosure: I'm originally from there). A lot has changed there since I left in 2005, and it was a welcome breath of fresh air.

I'm planning on Madison (which I've already been to and very much enjoy), and I'd like to explore Milwaukee and Minneapolis/St. Paul. I've got a list, so to speak.

Now, I don't know where I'd go as a hobbyist to seek nice providers.. Chicago, New York, Vegas, and LA are definitely full of ladies to choose from