The average income of the island's residents is $2.2 million, according to Bloomberg.
Fisher Island is a man-made island created by the government in 1906, when a canal was dug between South Beach and what is now the island, in order to ease traffic in the area.
The boat is a private shuttle for prospective and current residents of Palazzo Del Sol and Palazzo Della Luna, two of the island's newest and most luxurious condominium buildings.
It's only about a seven-minute boat ride from the Miami Beach Marina to Fisher Island.
This one is Helios, a 193-foot luxury yacht that belongs to billionaire Lorenzo Fertitta, former owner of the UFC.
About 700 families live in the island's 30 luxury condominium buildings, where units sell for an average of about $3.2 million.
The boat slips are "highly coveted" and will cost you a minimum of $125,000 and potentially well into the millions, publicist Lauren Marks told me.
All the golf carts are individually owned, but at the island's newest and most luxurious residences, Palazzo Del Sol (finished in 2016) and Palazzo Della Luna (expected to be completed in 2019), each resident is given a custom $20,000 Garia golf cart.
The speed limit on the island is a respectable 19 miles per hour. Some residents bring their cars on the island via the ferry, but during my tour, I mainly saw people getting around by golf cart.
Notable residents include Hasbro Toys CEO Alan Hassenfield, who bought an $8.2 million condo in Palazzo del Sol, Yard House founder and former CEO Steele Platt, and tennis player Caroline Wozniacki and her fiancé, former NBA player David Lee, who paid $13.5 million for a condo at Palazzo Del Sol.
Oprah Winfrey, Mel Brooks, and tennis star Boris Becker have also owned homes on the island.
Miami-Dade county real estate broker Dora Puig told me people move to the island for three main reasons: privacy, security, and the amenities.
"They have everything on the island: eight places to dine, golf, tennis," she said. "Probably one of the best tennis centers in the city. Two amazing marinas. So we cover a lot of ground."
Carl Fisher and his Alton Beach Realty Company had bought the island in 1919 from Miami's first black millionaire, Dana Dorsey, and expanded it with four times the land mass and deep-water docks.
Vanderbilt built the mansion in the 1930s as his own private retreat, surrounding it with lush landscaping, guest homes, tennis courts, and swimming pools.
In addition to its multimillion-dollar condos, Fisher Island offers luxury hotel accommodations that include four historic cottages, six courtyard villas, and a guest house with five suites. Rates range from about $625 to $3,050 per night.
"If you've been to the island, it's gorgeous," Puig told me back in February. "It feels like you're in the Caribbean, yet you're literally a three-minute boat ride to South Fifth Street to all the restaurants, and a five-minute boat ride to Downtown Miami."
The dress code is "casual elegant attire for ladies" and "collared shirts and pants for gentlemen," although "denim in good taste is permitted."
The Beach Club hosts themed events such as French Bistro Night, Full Moon Parties, Seafood Night, Clambakes, and Sunday Jazz Brunch.
The island has 18 courts with three types of playing surfaces: two grass courts, two hard courts, and 14 Har-Tru clay courts.
"A breathtaking location, year-round outdoor play — day and night — and a choice of three surfaces makes Fisher Island popular with players of all levels, including pros seeking pre-tournament practice," Tennis magazine reads.
The spa's services include personal training, group classes, facials, massages, and various "body excursions," including a cellulite sculpting body treatment and a coconut milk and honey wrap.
For most services on the island, including the restaurants, members don't pay with cash or credit card, but instead just put the expense on their membership tab, according to Marks.
The ferry is for residents only, but invited guests can board as long as they have pre-arranged security clearance.
The residents of Palazzo Del Sol and Palazzo Della Luna, however, have access to the same private shuttle boat that I took from the Miami Beach Marina.
"They love it because it's like their own aqua-Uber," Puig told me. "It takes them to South of Fifth, it takes them to Cipriani, it'll take them to restaurants. It'll take them and pick them up from someone's house for dinner."
I was told the sand is raked every single morning to keep it clean and pristine.
Some students come from off-island to attend the school, Marks told me.
The aviary staff adopts, rescues, and rehabilitates exotic birds.
I saw several different types of birds, including geese and what I think was white ibis.
If I closed my eyes to obscure the golf courts and the grass that was so perfectly manicured it almost looked fake, I could've imagined myself to be in a tropical oasis.
Because most residents don't live on Fisher Island year-round, that means there are often more employees on the island than residents, Marks told me.
Even more amazing is that that I didn't even notice this sizeable workforce. They had what I can only describe as an invisible impact on the perfectly manicured island.
The island felt like a pristine, secluded oasis, but it's also less than 10 minutes by boat from bustling South Beach.
While I'm not sure I'd want to live in such a mellow locale at this point in my life, I can certainly see the appeal for upper-crust businesspeople and families looking for a quiet vacation home where they can golf, play tennis, and relax on private beaches with their fellow millionaires.
I spent 2 weeks in India. A highlight was visiting a small mountain town so beautiful it didn't seem real. 
I quit McKinsey after 1.5 years. I was making over $200k but my mental health was shattered.
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