I am going to throughout a different opinion. Spray tanning does nothing to help prevent sun burn. While tanning may not be great it does provide protection against sunburn which is far more dangerous then tanning. I would tan for 5 weeks build up a base tan so you get the desired look and the protection that sunscreen can not always provide because we all forget to reapply or miss a spot. 5 weeks of tanning is probably not going to cause any real damage and may prevent a serious burn. I did this on my husbands request for trip and I am ubber pale and somehow have a great tan that others ask me about and when we hang out at the pool I have not burned all summer even if I forgot sunscreen. Most tanning salons also do spray tanning which lasts about a week and is supposed to be much realler looking then anything you can do at home.
Good luck on whatever you decide
Good luck on whatever you decide