Congratulations on taking your wife out. I tandem fished on a Hobie outfitter with my wife for 5 years 90% offshore.
Rented an Outfitter for her first time out. We just cleared the channel at Newport and the first little swell scared the hell out of her. He screamed turn around and I did. Her confidence quickly grew and now she is fearless (a little too fearless at times). We easily covered 10-15 miles almost every weekend on each outing.
Getting older means we upgraded to an Tandem Island. Now we can make La Jolla from Dana Landing
.
If I can just keep it from taking on gallons of water in mild seas I will be happy.
P.S. Never go completely against your wife's will to ensure her safety. Gently push the envelope on her comfort zone and she will grow accordingly.