You would have to factor in the price of the purchase of the scooter, maintenance, insurance, license and gas.
Life is not just about saving money, so there are of course other non-financial factors to keep in mind: enjoyment, freedom to practically go where and when you want, etc. In your case, living in Aruba where you can use a scooter all year round, I would tend to think that getting a small scooter would be your best option overall even if it would cost more, but check your figure and decide based on your priorities.