Upbeat 80's love songs?

"When I Think Of You" by Janet Jackson

"Just Like Heaven" by The Cure

"True" by Spandau Ballet

"Oh Sherrie" by Steve Perry

. . .

As was mentioned in other comments, it's not what you think they would want to hear, so much as that the songs you like, that make you think of them. That will make more of an impact.

Good luck, and please let us know how they receive the mixtape.