Been trying to do some sketching with my iPad this summer. So far I've found it pretty useless to use outside in the sun as you can imagine. I may experiment with making some sort of hood for the thing. But I really like it for sketching in the evening where using regular paints really would be difficult. I've downloaded a bunch of different apps and have been bouncing back and forth between then but so far my fav is Procreate. I also am really liking the nomad brush stylus when I sketch. I just can't just used to using my finger to draw and the rubber tipped stylus is OK but it tend to grab onto the glass. I like the fluidity of the brush better.
It's also fun to take on a long car trip. Just make sure someone else is driving! These were done on the highway some where near Albany, NY. I get car sick if I try to read in the car but luckily doodling doesn't bother me.