I also went on a tropical vacation while I was doing my Accutane course. My dermatologist recommend that I use 60 SPF and reapplied every 2 hours. I was on 60mg at that point in my treatment and was 4 months into my course. That went really well for me. I was in the keys and spent lots of time in the sun and in the water. No burning or anything. I assume since your a low dose treatment this would work will for you too. My dermatologist also recommended wearing a big hat. I wasn't into the big ol shade hat look though, so I skipped that.

Thanks so much for your response!

Ill be on 20mg a day when i go ( in 2 weeks), but still a bit weary.

Ive purchased invisible zinc which is supposed to be good.

What SPF did you use? And did you tan?

I used CeraVe 50 SPF from ULTA. Thought is was 60 but I was mistaken. I did get a tan as well. I wasn't going out of my way to avoid the sun at all. I've heard that zinc sunscreen is good too.