Theres so many great games, I've had my PSVR for a couple of months now having grabbed the Skyrim Bundle.
The game I recommend to showcase VR right now would be Astro Bot, easy to get into, simple but creative controls, SO immersive and gorgeous worlds.
With guests I try to remember its not likely that anyone has their VR legs yet, so games that move at a slower pace, sitting down is usually the best case scenario. Had a friend over from out of town, he was doing great with VR for his first time playing over the weekend, graduated him to Gran Turismo Sport near the end of the weekend and he got to feeling pretty sick, I over estimated how fast he was getting his VR legs.
My favs, my top 10 right now.
Resident Evil 7
Superhot VR
Astro Bot: Rescue Mission
Moss
RIGS
Gran Turismo Sport
Firewall Zero Hour
Arizona Sunshine
Job Simulator
Thumper
Honorable mentions to Farpoint, Rec Room and Honor and Duty which is in beta but just simple and fun.
In the future Media Molecules Dreams will be the pinnacle of PSVR with a Little Big Planet style community, PSVR content day confirmed, PSVR user created levels confirmed, that according to what I've read must be completed and tested to make sure players don't get sick. So basically you'll be able to create a game for your family to play the next, next time they come over. A beta will likely happen in 2018 and the game will launch sometime in 2019.