will you be staying at a campground of any sorts? If so, there is always some kind of overhang or something to get under.
Doing canoeing or whatever where one is really out in the woods, having a tarp to setup as a cooking/sitting out of the rain area is generally what we have always done, but since I started bike touring, and putting an emphasis on not taking stuff that isnt needed, I've never taken a tarp with me.
Part of that is because Ive pretty much always toured in summer months, or as you say, in good weather, so the few times that rain has been an issue, I've been in campgrounds or whatever where some sort of shelter was available, sometimes even where I could set up my tent under shelter (awnings, pavillions, in someones garage with their permission (in France once)

reasonable question, but as the others say, if you are really stuck, the vestibule is always an option, even if it isnt ideal for food smells and tents.

chances are though that you can find alternatives.