Without seeing the book I'd imagine Sanji is adventurous to some degree? Cooking with new ingredients, searching for the all blue on the sea, imagining just what he can do with the mythical resource, and of course meeting all kinds of new pretty ladies in the world. Like surely he wouldn't be ALL about adventuring but I can't see him not enjoying it either
Oh, I found this comment on an ancient forum thread. I think the poster mistranslates "bravery" for what should be adventurousness? One Piece Blue/Red - Page 4