What is the best way to get a tan without using tanning salons or tanning lotion?

I am going on a Tropical Vaction and where i live we dont get much sun so i want to come back with an amazing tan so what is the best way?What is the best way to get a tan without using tanning salons or tanning lotion?
ehh you cant really you kinda need to use the lotion if you dont want to go to the salon of just wait and do it when you go on vactionWhat is the best way to get a tan without using tanning salons or tanning lotion?
Put on some tanning oil and lay down in the sun, I guess.

skin beauty

vegetable oil

cooking oil

bb cream