Not very accurate, but gives some workable suggestions
@sydneyfalk @creatrixtiara yes this:
http://www.unmung.com/mastoview
Very good to make sure a tag is not ironically applied...
(and forgot to mention, upside's thingydoo he mentioned here gives very interesting information worth looking at)
@upside @creatrixtiara
(also probably worth doing some searches on that thingydoo that shows you a random example of toots from a specific instance, in case you're wondering about specific places being suitable or not)