Is this a good guinea pig sign?

  I switched my cage to a fleece floor C & C cage and its a lot bigger. My oldest guinea pig, Alexa, is running to and from each side of the cage, and going fast. Is this good or is this hyper-excitementt? I think she is just testing the new area of the cage but i want to be sure. Thanks (:
That is a great sign! If I am correct, it may be popcorning what she is doing. It just may not seem like it because there is no bedding that can "popcorn". Small animals love running around when they are happy. If she didn't like it, she would be moping around, lazy, sad, and aggressive towards other piggies. I am pretty sure she likes it, but if you are worried just keep an eye on her to make sure she is still eating and acting healthy and is not stressed or depressed.
I wouldn't worry. Small pets like guineas, bunnies, and hammies generally love to stretch their legs anytime you put them in a bigger environment. Your guinea is just REALLY happy!:)
This is a good sign, it shows that she is more comfortable and is happy moving about - can only be a good thing!
My guinea pigs all do that when i clean their c & c cage or when i first put them in it. your guinea pig is extremely happy (:
Yes! it means she's excited!