Is it worth for a couple to spend some days in Male before embarking to a liveaboard diving trip?
I'd like to know what are the interesting things to see, where to eat, to know local culture, and also what kind of precaution shoud I have concerning safety, health, clothing and behavior.
You could probably see all that's worth seeing in Male in a day. It's not really set up for tourism, most visitors get off the international flights and go straight to the resorts.
Be aware that while it's calm at the moment, recently there has been some unrest. You're very unlikely to see anything, but if there is a protest happening, don't hang around to watch.
More tips and background on the unrest here:
Phil at the safety hub almost 6 years ago