Hi Sullafon - belated congratulations on your wedding!
Most if not everywhere will still be open - so I'll try and recommend some restaurants that OH and I like to frequent when our children aren't with us in PP (which isn't very often….) For food: O Lume and Siller can't really be beaten - though neither of them have a view - but if the weather is good, the little courtyard garden at O Lume is lovely. La Llonja has great views and an excellent MDD - Stay obviously great views also, but not quite such good food - but you can have a gorgeously romantic evening there, especially because they have fantastic terrace heaters and even blankets if it is a little chilly. Start off the evening with a cocktail at Cappuccino - or the new wine bar, Pan Ta Lan - lovely! One thing we did in April was hire a boat for a sunset cruise - through North Mallorca Charters - you'd need to take a warm jacket as the temperature drops with the sunset, but it was a really blissful evening, including a great buffet supper and plenty of wine.Sebastian is a charming host. We went a bit mad and chartered the whole boat just for ourselves - which made it very special. They do longer day trips too.
Hope you have a lovely stay!