It's a great niche with lots of potential. I am starting my own but it's very narrow and not sure how I'll be monetising it but it will be travelling Europe for swing dancing camps and sight-seeing. My target audience will be other lindy hoppers/swing dancers (people I love and get to interact with as I also dance for the past 5 years and still counting). This blog will talk about some camps that I visit throughout Europe and the cities I do sight-seeing at.
My monetisation methods going to be selling dancing gear, probably via Amazon affiliates or something ... also advertisements, I really don't see why I couldn't make another $1K/mo by selling ad banner spaces for camps and apparel makers (the ones that have no affiliate programs) for their perfect target audience.
Of course, I am certain, once my blog reaches a certain amount of popularity, camp organisers will contact me to actually attend their classes as I will be promoting their events on my post(s). So free travelling + income from blogging ... hmm ...
Also, consider travel vlogging. I know there are many great vloggers out there but if your niche is super narrow and specific, you could do well.