You said after I faced the T. rex! :-( Also they reckon the spinosaurus wouldn't have hunted in water, but stood on the banks with its nose in the water. It's got hundreds of tiny pressure sensors similar to a crocodile or shark in its snout, and would only have eaten fish. So as long as I stay away from shore, I'd be ok. Just swim to the opposite bank to the spinosaurus. But I guess that leads me to raptor territory...

Yes you're correct about the spino but it still would hunt during the bad seasons and I'm sure there aren't fish big enough to feed it so it might hunt still