When I had Allie, she ate like Caesar lol. She was about 3.5' and eating small rats every week. She would get a big lump, go up on her perch and it would be gone in a couple days lol.
As for activity, I always see my snakes out, even my BP is out stretched out in the front of the cage probably 3 nights a week. Everyone else, pretty much just sits out 24/7 anyways lol.
Rango was being the oddball today but usually he is out much more than that lol.