Some good ideas

Write little romantic notes and leave them everywhere (pockets, briefcase, lunchbox, car, mirror etc.)

Set a bath with floating flowers and lots of candles.

Feed each other chocolates & cherries.

Send a romantic message that the whole world can see with a personalized airplane drawn banner.

Following a bubble bath you’ve prepared for the, wrap them in a towel that you’ve warmed up in the dryer.

Buy a lottery ticket. Give it to your partner with a little note attached: “I hit the jackpot when I married you!”