"Tan" means several different things in English.
For the general color (similar to beige), the word used in Spanish is "castaño" which means "chestnut".
For someone who's skin has darkened due to exposure to the sun, the word use in Spanish is "bronceado", which means "bronzed". The act of "tanning" in this way is "broncearse".
For the act of curing leather, the Spanish word is "curtir".
I like your tan= in Spanish Quiero su bronceado
eres tan dulce
tan agradable
no tan grande...?
"Si tan sólo..."
espero tan
Para hacer tan.
Tan cruel.
Tan verdad
bronceado falso
Yo no soy tan bueno or no soy tan bueno
To a female you say, "Tú eres tan bonita." To a male, "Tú eres tan bonito."