Oh god no, no, no, a million times NO.
I'm a mostly introverted person. I would MUCH rather go to the office 5 days a week for 8 hours each day than have to be stuck living with a group of coworkers for 2 weeks straight in a house in the woods.
After 8 hours of work the last thing I need is being forced to spend the rest of the 16 hours in the day with the same group of people.
If you're going to do a meet-up for a fully remote company, please do it in a location with several hotels and let every employee arrange their own accommodation reimbursed. Keep mandatory activities to no more than 6-8 hours a day, don't pressure people to spend their evenings and weekends drinking with the company. Outside of meeting hours, let people enjoy the place however they like -- adults are more than capable of figuring out recreational activities on their own, and you don't need to provide structure 24/7. If you pick Las Vegas I'm sure a whole bunch of employees will self-organize themselves and go gambling and drinking, but I have no interest in that stuff and you'll probably find me in some national park during the weekend.