My ideal job, tbh, would be something that was full-time data entry. When I worked at Washington Mutual for two minutes, the first minute was data entry (then they bumped me up to a loan processor because it was the refi boom). And I always had something to do but with very little stress about getting it done. I'm a fast typist when I don't have to think about what I want to say, and I find data entry very relaxing. If I could somehow do data entry full time but with a flexible schedule as long as I did 40 hours a week, that would be my perfect job.
I actually don't like a lot of down time. Even when I can sit at my desk and spread out some task because it's a slow day and I don't want to be wandering the lab looking for a bunch of 5-minute tasks to fill my day, I'm incredibly bad at being inefficient at work. The water filtering forces me to spend 3.5+ hours with nothing to do, so I fill it with other work (writing/reading), but it's understood that that's what I'm being paid to do. Filling 3.5 hours in the lab is torture.
I don't mind when we're screaming busy. Everyone else runs around like their heads are on fire, but I've found that everything gets done faster if you just do the work in a methodical way, and then you're not searching for work at the end of the day.