"I get a sun tan" --> You can say "Me bronceé". And, from the "Word reference" website: suntan (go brown from the sun): "broncear" suntan (tan from the sun): "bronceado" suntan (lotion: for tanning): "bronceador"

En España además de BRONCEARSE, también decimos "PONERSE MORENO/A" --- I got a suntan: Me puse morena --- He got a suntan: Se puso moreno --- If you spend the whole morning in the beach you will get a suntan: Si pasas toda la mañana en la playa te pondrás moreno/a

Thank you very much:)