First thing you need to do is go to some ranges and shoot whatever you can find. Some poeple, though great shooters, just can't seem to hit anything with a revolver. Some guys, even big stong ones, can't seem to keep from "limp wristing" a glock, but can hand .44mag like it's a .22 Best thing to do is find out what you are comfortable shooting with. Then move on to gun selection. Now, for the situations that you have mentioned, I'll make two suggestions.
For Autos, if you can shoot them well, a Ruger P345. It's a polymer frame and comes in stainless steel. That means it will hold up to moderate use and even the salt water very well as long as you give it a little attention here and there. It is single stacked so the grip is not too big and even your wife should be able to get a good grip with it. It shoots the .45acp which can handle anything from personal protection out and about to home defense shooting through furniture in the house if necessary, and if loaded with the right bullets, is as small as I would like to go for protedtion in the woods from the 4 legged threats. Is has a bilt in rail so you can mount a light/laser if you desire, which I personally consider a must for home defense.
For a revolver, I would suggest a Ruger GP100 in .357mag, stainless steel with a 4" barrel. This is a work horse of a gun, it is built like a tank, and is a great shooter. It holds 6 shoots, which should be enough for most situations, of .357 or .38spl including the +P stuff. It is a revolver so it is not as ammo sensitive as an auto. That means you can load snake shot if necessary, .357mag hardcast loads for bear and cat scountry and ant .357 or .38spl+p JHP for personal and or home defense. If you could only have one gun, you would be hard pressed to find something for useful that a good .357 revolver.