Other things you might want to discuss: friendship, and sharing.
Introducing the letter H
Call 2-3 students over to a table, have the students decorate the front of their hearts; while two students are working on decorating their hearts, have the other student tell you what teacher they would like to give their heart to. Ask them what they would like to say to the teacher and write it on the back of the heart with the teacher’s name.
Once all the students are done, take a center trip and let the students hand out their Valentines.
(Ask you students what color should the clouds be to signify a rainy day)