Kris, Ginnie Springs does not allow dogs. Except for the owner's, that is. A really friendly black lab, if you see that dog, Ginnie's owner is not far away.
I am not quite sure how Andy manages to get his flock in, but hey.
As BugMan mentioned, the spring water is always 72, but the river water can vary. If I recall correctly, it should be pretty close to the same temp as the springs at that time of the year, or possibly a little cooler.
Becky, if you want to bring something food wise, get something that goes well in omelets for our communal breakfasts. Post what it is that you are bringing, so others have some idea what not to bring. Ideas include shredded cheese, sausage, eggs, bell peppers, diced ham, diced onions, bacon bits, mushrooms, black olives, salsa, and whatever else someone might like with omelets.