for durability a pentax optio w20 or w30 can't be beat,

it does have a simple very easy to use zoom lens and is best used with a hoodman loupe

but it takes good pictures

you would need to try it out first at a store, I believe they sell them at best buy and probably other mass marketers so you could probably

one battery lasts for a couple hundred shots before needing recharge

and they are tiny so you could carry a few with you

but it is waterproof and shock proof so you can drop it and use it in the rain or supposedly even underwater (though I haven't tried)