Carry on regardless
Want to keep it close to the campsite? Rain shouldn’t impede you if you want to head outdoors; some landscapes look their best in drifting rain, like moors or spectacular coastline. Make sure everybody has wet weather gear — and that you have a waterproof map — before you set off on a hike or a walk. Stick to forests and places with natural cover if you’d like some relief from the rain. Find a cave? Make ‘cave paintings’ with wet hand prints.
Play Poohsticks, skim puddles with rocks (or just have a big splash) and generally make the most of the wet landscape. Collect leaves, compete to see who can find the oddest rock, gather moss for homemade terrariums if you’re in an area that allows it, and go frog and newt-spotting; some animals positively love the rain.
Swimming in the rain can be fun too, as you’ll have some protection from midges and mosquitos. Pack extra rubbish bags, to keep towels and changes of clothing warm and dry when you exit the water. But don’t go near unclean or fast-flowing water (rain won’t make it more hygienic or safer) and stay well away during lightning storms.