I have several custom fitter ziploc bags that can fit the D70 + 18-70 lens.. and still can continue to shot even in choppy weather.. lol..
I use the same when shooting in the rain with my D100.. not much problem.. always carry some distilled bottled water.. you will need this to wipe the cam clean of all the salt.. after which.. wrap the cam in a clean face towel.. (good morning towel) and keep.. it will be ok..
My D100 has survived 4 fishing trips.. with sea water being splashed directly from a fish as it was being reeled in..