This happened to us the day before New Years Eve. Ironically we had planned a ferry trip across Auckland harbour and hike to a volcano crater (the most organised physical, outdoors activity we fancied on our trip) and the heavens opened. Perusing the cinema listings, we didn't really fancy watching any thing there, so thought up a few amusing alternatives.
1) Nap after taking a leisurely bath with a glass of wine in one hand.
2) Write that novel you have always wanted to.
3) Mooch in electronics stores searching for camera straps, unicorn tears and chickens teeth. Bonus points for 3 or more selfies on sample iphones in a row.
4) Google "What to do in xxx when it rains". Get bored and begin to draft random blog posts.
5) Gnash your teeth, wail like a grief stricken football fan and cry Hollywood-style. (Or just sigh a little less dramatically.)
6) Hunt out the nearest well rated afternoon tea, and spend the afternoon making up stories about your fellow pinky raisers.
7) Lurk in burger joints checking the local TV schedules. Desperately attempt to download movies & watch them through the USB cord you accidentally brought from the other side of the world.
8) Threaten to buy board games. Revive the smartphone scrabble game you last played 6 months ago. Cackle maniacally when you win.
9) Hope there is a gig on, only to realise they were all last week.
10) Google search for local cat cafes & smooch a few furry animals.
11) Brunch ridiculously leisurely - bonus points for watching sous chefs and narrating their every chop of the knife. Every. Chop. Of. The. Knife.
12) Nap again to ensure an even spread of pillow marks on your cheek.
13) Research next day activities once the rain clouds clear & get really adventurous (try to book a flight to a nearby island.)
14) Finish that book series you've been meaning to complete for an age. Try not to drop your Kindle on your face.
15) Or you could pop out to the nearest coffee shop & bakery and simply enjoy the leisurely holiday afternoon you hanker for but don't normally have the time to indulge in.
* Of course you could always have a chat with the hotel concierge or web search local free museums and art galleries, but that's not as fun, right?