HAHAHA! Bath in a crisp, that is hilarious! It actually means something quite different than the sentence you'd like to understand...
"Bathed in sunshine" means illuminated from all sides by sunlight.
"Crisp, clean sunshine" means very pure and sharp.
I suppose what made this confusing for you was the "crisp, clean" part. In English, instead of saying "this and that" with adjectives it's quite posh to say "this, that".
"Bath in a crisp" means soaking in fried potato. Hilarious, thank you :)