Activity can mean different things: temperatures uncomfortable (looking for the right ones) which btw doesn't seem to apply here, or it can mean hunger-
which seems likely since he didn't eat last time. Coupled with time in the water bowl can indicate mites though...do look closely, with a magnifier if you have
one...check on the snake & in the water both. Mites aren't merely annoying...they can kill snakes because their population expands exponentially...they cause
dehydration from blood loss (which is why snakes head for the water bowl, also presumably to relieve their itchy bites).
While some snakes like to soak when they'll be shedding soon, they aren't usually more active at that time. Shedding snakes usually hide more. So please do
look again for mites.