Cute date ideas reminiscent of Buddy the elf's ideas from "Elf" that seem juvenile but are actually endearing
Raking leaves into a pile and then jumping into them.
Going to the gas station to buy slurpees and pizza and then putting temporary tattoos on each other from the coin machines near the door
Going to the library and finding the archive section to look at old magazines from yesteryear
Going to the library and finding the archive image section and looking at pictures of mutual interests
Going to the antique store and looking at old pictures of people who lived before and making fun of their dress or making up extravagant stories about the lives they might have had.