Fujifilm FinePix XP150 Digital Camera Review$279.95
Based on the XP150's official durability ratings, it's right up there with some of the toughest tough-cams.
It's waterproof to 33 feet. A few models can dive down to 40 feet, but 33 feet is still respectable, and enough for most folks' gentle waterproofing needs. It isn't designed for use in hot water (like hot springs) and it needs to be rinsed in fresh water after any amount of time in salt water. It isn't a good idea to keep it underwater for longer than an hour at a time, and the waterproofing may be compromised if you drop it (even though it's designed to be shockproof as well).
It's shockproof to 6.6 feet, tied with a few other cameras for the title of least-smashable camera. It's more than enough to survive some tumbles from chest- or shoulder-height, let alone toddler time. If it hits the pavement too hard, the waterproofing might be compromised, so think of the shockproofing as an insurance policy, not a party trick.
It's freezeproof to 14 degrees Fahrenheit. This rating is common to just about every tough-cam. Basically, you can take it skiing, and it'll work correctly.
And finally, it's dustptoof. All of the moving parts are protected by glass, plastic, or rubber, so the lens won't get jammed up by an errant grain of sand.
The XP150 should be durable enough for most folks' vacations, basically. It'll survive the beach, the pool, the slopes, the state park, or whatever. Serious divers should invest in underwater housing for a more capable camera; the photos will be much better, and you'll be able to dive deeper.