Inside one of Surf Simply resort’s three gleaming new glass-walled video-coaching suites, I’m staring at a giant screen freeze-frame of myself taking off into an overhead wave. It is a glorious shot, hair flying, stance low, a white-water trail streaming behind me to the lip of the wave.

“So what do we see here, Bonnie?” asks Jessie Carnes, one of the resort’s four owners and my coach for the week. What the screen doesn’t yet show, but what she and I both know: It’s the moment right before I biff the wave and fly face-first into the Pacific.

What’s different from every other time I biff it face-first, though, is that this time I can see that both of my hands are coming too far forward into the turn, pitching my upper body toward the water. I say so, and Ms. Carnes rewards me with a radiant grin.

“Exactly,” she says, advancing the video so that we see the ensuing fall in real time. “Keep your head up and your hands over the rails” — left hand over the left side of the board, right hand over the right side — “and your weight will stay over the board driving into the turn.”

It’s late November here at the brand-new Surf Simply resort in Nosara, Costa Rica, where up to eight cameras were trained on me and the other 11 guests in the water during the morning’s surf session. Within the hour, video footage was loaded onto the resort’s private server and edited into a personal highlight reel, cut with skill-building lessons that are customized for each surfer. The coaches then run through a “theory” session with that surfer, going over the tape and running drills to improve performance.

The founder of Surf Simply, Ru Hill, moved here from England and started teaching out of his car in 2007; three years later, he opened the original coaching resort a short distance from Playa Guiones, a four-mile span of white-sand beach featuring some of the most consistent surf in the world. Since then, Surf Simply has become a premier surf destination, one that routinely gets booked out a year in advance.

Last year, Mr. Hill and his partners — Ms. Carnes, Daniela Acosta and Harry Knight — started building an ecologically thoughtful but technologically sophisticated new iteration of the resort: An intimate, minimalist building tucked under the jungle canopy, bordering the Reserva Biológica Nosara, with a walking path right to Playa Guiones. The four entrepreneurs hired Gensler — the renowned San Francisco design firm behind such projects as the original Apple stores, Facebook headquarters and Seoul Incheon International Airport — to bring it to reality. They officially moved into the new digs a month before my visit.