Maybe you have to pay taxes yearly on the boat. On my car it's 3% and last year the government said it's worth 180 million pesos, but it's real market value is 130 million (before all the mods I did). My tax bill comes soon, roughly $1317 at today's rate

it's kind of luxury tax because the rates increase with the value of the car. To my knowledge, Colombia doesn't have a boat manufacturer and they import from Brazil or USA. The manufacturer from Brazil is Fibrafort
www.fibrafort.com.br and the distributor in Colombia is
www.botescolombia.com
I also wouldn't want to depend on a 10k boat to bring people to Islas Rosarios. Any mechanical issues and you're in a tough spot. It's a 25 mile ride in open ocean to those islands and to my knowledge, there's no Seatow to go get you. At the minimum, I would look for a decent hull, and then invest in 2x good outboard engines. "Fuera de borda". A quick google search came up with a new 300HP Suzuki going for 135.000.000 ($31,000 today's exchange). Sure you can find a 200HP for cheaper, but this should give you an idea what to expect.
Then there's the issue of getting the Visa Tipo V to legally make income here. It's based on a multiplier of the SMMLV (minimum wage) and this year it's roughly $30,000 in an account. Also those Visa agencies are the worst. It's always a problem. Ask me how I know lol
Then to do the business, you have to pay a lot of extra things when you contract an employee. You're obligated to pay double on vacation which is withheld when you pay your employee "vacation hold". You're also required to pay a 13th month at the end of the year for bonus. And there's some extra stuff that needs to be paid. But you can pay them as a contractor, but you have to be careful of reclassification, which is the DIAN sees the contractor, not as contractor, but employee. There is legal costs behind that. Basically he can't have a fixed hourly schedule, no vacation days, and you can't have a contract that he only works for you. You also start to pay taxes after 50.000.000 ($12000) on YOUR yearly income.
4x1000 is you have to pay 4 pesos for every 1000 pesos transferred.
I know this is a lot, but these are things that need to be considered. The benefit is that many foreigners will be paying you in USD/EURO so you can accept payments through PayPal without exchange rates, and you would stay in the USA tax ecosystem. In this case you would have to consult with a accountant about reducing your tax liability in USA and do things correctly to avoid audits. The IRS doesn't like when you are 6 months outside of the country working and they change the classification of the business. This is why businesses use third-party agencies "EOR" to take care of the legal stuff when hiring overseas. Going this route, forget hiring as a contractor, they won't do it for blue collar type work. And as a full-time employee you will still pay the government benefits so it doesn't make sense. Now you have a third-party agency being middle man and charging a fee. But is good if you are receiving many payments in USD and don't have many COP to pay your employees.
If you decide to go ahead with this, let me know. I always am open to making investments to new businesses. And take a look at Brazil, it's beautiful there. And I think it's calmer, you don't have to go to the dock everyday and try to hustle foreigners to sell tours

Brazil taxes are high too, but at least you don't have to deal with importing, nationalization, and documents.
Edit: and you need to know how to speak spanish to operate safely there. Colombians are hustlers. You can be sure that your employees will try to pocket money. You can be sure that any service paid for the boat, they will try to charge you extra. It's the culture. Every service paid, I have to fight. It took a while to find trustworthy mechanic for my Mustang.
Also, if you are interested in Brazil, I have a friend that I met years ago at a jet ski event, he is a vendor for fibrafort in Salvador.