Rain is the weather most people wait out, which is why a wet afternoon is the quietest the outdoors ever gets. Paths that are crowded on Sunday are empty. Streets you've walked a hundred times reflect, drip and smell different. And unless it's a storm with lightning or a wind that bends trees, rain is not dangerous; it's just wet, and wet is a solvable problem.
The ideas here are for adults, on their own or with a friend. They're sorted by how much rain you're prepared to be in, from a light drizzle to a proper downpour, with a few for the hour after it stops.
Three things change when it rains. First, the light goes soft and even, which is why photographers like overcast days: no harsh shadows, colors look deeper, wet surfaces pick up reflections. Second, the sounds change: traffic hisses, gutters run, and a hood turns everything into a private radio. Third, the places that are normally full are suddenly yours. You can walk a park path at three on a Saturday afternoon and meet two people and a dog.
The practical side is simpler than it looks: a jacket with a hood that actually keeps water out, shoes you don't mind soaking, and a dry pair of socks waiting at home. An umbrella is optional and in any wind a nuisance. A warm shower afterward is part of the plan, not a consolation.
Light rain changes almost nothing except who else is out. Everything below is an ordinary walk with one extra job.
If it's coming down properly, the plan changes from walking to being somewhere.
The best part of a rainy day is the twenty minutes after the last drop, and most people miss it because they've stopped checking.
Rain is a good excuse for company. Two people under two hoods, walking side by side, talk more easily than they would across a table, and there is a shared ridiculousness in being out in it at all. Split the umbrella count between you, one takes colors, the other takes broken ones. Or agree on a café at the far end of a mile and walk to it, wet, as the reward.
If you'd like the deciding done for you, RLQuest picks three to ten quests each morning from a library of more than 2,700, and it takes the weather into account. On a wet day the quests shift: be outside between noon and six while it's raining, photograph something mostly blue on a wet day, uncover three new map tiles while it rains, or be out early while the ground is still wet. The app checks what it can, the recorded route, new tiles on your hexagon map, the photo itself, and says so when it can't. Weather is a filter for the quests, not a dare.
RLQuest is free to download for iPhone and Android, with a Premium subscription that adds more quests per day. The ideas above need nothing but a jacket.