Write a note saying 'I thought of you today, and it made me smile'
Leave the note somewhere your partner is sure to find it
Organize a mystery trip for your and your partner. Some travel agents will organize mystery packages where the destination of the trip is kept secret until you are actually on the plane or arrive at the destination.
When your partner is having a shower or bath, take his/her towel and place it in the dryer to make it really warm.
