A good way to find out where they are crossing those streams is to walk along and look for places where the bank looks chewed up and you should see deer tracks. I've found that deer usually pick the same crossing if the stream is normally deep. If you are finding beds I'd get out of there and find where they cross the stream and walk the opposite direction and pay close attention to the brush around the trails. Chances are that the leaves and twigs will be bit off. This means that they are browsing either on their way to a field or from a field to their beds. Look for droppings and not just one pile, look for many piles. Deer are moving through this area and they usually deficate shortly after getting up from their bed and while they are eating. Once you find these things you can decide on where to set up your stand. As Richie 3 said, I too am not by any means an expert but I usually get deer every year and I learned all this from my dad and my grandpa since I was very young.