Seas the Keys / Mitch’s company is our go to transportation company for when we have a big group that wants to spend a day or night in Key West. There aren’t many options for transportation services in the Keys; I could only find one other company (that was not a broker) and their price was higher.
We got a sprinter van for 13 people, it was ~$90 per person after 20% tip and that was for 10 hours.
I definitely recommend Mitch and his fleet. They are kind, punctual and safe drivers.