I’m slowly getting to my first 99. It may be cooking because it’s breeze and I can afk Jug of Wines while on the bus, etc. I always wanted mining to be my first 99 but it’s a bitch of a grind. 
Discussion
Mining, woodcutting, and fishing are the most based pacifist 99s to get.
Once you get 90 woodcutting it’s the most AFK by far at redwoods. Star mining is a close second but there is the world hopping a star locating to consider.