I would highly recommend pre-tanning as much as possible. Even if you have to use a tanning bed. You will still need sunscreen (extra virgin coconut oil with carrot seed oil is a great natural sunscreen that will give you a beautiful tan) but you should not have a problem with burning. Also, I recommend pre-conditioning your liver as well.
We are about as Irish as they come and two colors white/red…lol but with a little bit of sun before hand, maybe hit the tanning bed and if you are really concerned you can do the whole spray tan thing (cosmetic/appearance). Ultimately, nothing will ruin your vacation like a severe sun burn so stock up on water proof 25 + SPF….hell it goes up to 100 nowadays probably all marketing bullshit but You get the point, I hit it once in the morning and reapply early afternoon. Good to go.
Pride goeth before the fall or sunburn in this case. Don't be shy when applying or skimp on the sun screen; you could regret it. Tip: aerosol sun screen can really burn on freshly "groomed" bits...know it too well. I thought the aerosol was a better option than liberally applying lotion to the nether regions in public. It was akin to a blow torch...but I didn't burn, lol. Either way reapply often. Scott