The activity level is because he's in the new tub and thoroughly exploring it. As for the paper towel, they like to burrow. If "messy" means that he's rearranged it and it isn't neat and tidy any more, don't worry about it. Let him burrow and rearrange, it'll probably taper off as he settles into the new quarters. And it'll it doesn't, you get the amusement of seeing what the latest changes are.
Sent using software and hardware