I brought a DSLR, iPhone, waterproof Nikon point and shoot with us to Alaska. On whale watching day, naturally, I brought my DSLR, with zoom lens and got some AMAZING shots...whale spouts, barnacles on the back of the whales, their flukes. Loved them all, though I hated schelpping the monstrosity around. The next day we went on a crabbing tour and I didn't want to schlep the DSLR, figuring it's just crab, no big deal. I'm not going to bother. I'll just use the iPhone. I regret it every time I look at the pics. We happened upon an island full of eagles. The iPhone, though great, just could not keep up and didn't cut it. All those beautiful eagles, turned out just crappy in the iPhone pics. I'm still kicking myself for not bringing the DSLR that day.
As for the waterproof Nikon (and I love Nikons, my DSLR is a Nikon) but the point and shoot...it was crap. I've used it before in the Caribbean and I'm thankful for it for underwater shots, but it just can't keep up with even cell phone camera technology these days.