Taking a shower. Similar to sunscreen, any other soaps, hair or beauty products can cause a cloudy buildup on your stone, or worse, under your stone—which is much harder to clean. Shampoos and body washes are a no-go. The same applies for your favorite scented lotion that you apply post-shower or that hair serum.
Hitting the gym. Wearing your ring during cardio activities won’t do it any harm, but it’s the weight lifting that can take a toll. The pressure of the weight’s bars (or really, any amount of strong pressure) that’s applied to your band might bend it, which is especially bad for a pavé band because the smaller stones can fall right out of their setting. As for contact sports, definitely take off the ring, or risk a serious injury thanks to ring avulsion.
Soaking in a pool or hot tub. Losing your ring here isn’t as big of an issue compared with the open sea (filters can be checked and the pool can be drained), but it’s the chemicals, like chlorine, that do the damage. After time, they can seriously discolor the metals.