im sure my mate damo will be along soon to tell you about his watery experiences, but it the mean time all ill say is that hes given both of his jimnys some abuse through water, both without snorkels and both are still running as smooth as they were before
another really obvious thing to do is remove the viscous engine fan and fit an electric fan. not only will you protect your radiator in the rare chance that it gets sucked towards the rad, but you can turn an electric off to stop water and other muddy rubbish being flung around your engine bay. fitting one to my vit made cleaning the engine after a lot easier.