I am leaving on a vacation next week, how long should I go for? I want a tan. Should I go to Aruba, the flight

Question

is cheaper, or to DR the flight is more expensive but the hotel is cheaper. I think I can save about $200 for DR, but I heard that it's hotter and the sun is better in Aruba. I just want to get tanned. How long do I need to go there for a tan? Two or three days or longer?