Skiing, should I stop using Retin-A treatment (1x wk) or can I continue use and protect with 50spf, helmet and sunglasses?

I plan to go skiing for a week at the end of the month and I just started retin-a (used 1x) I plan to use once a week after I return from skiing, 2x a wk). If I continue my plan now, I would have used it, 4x before skiing. My cheeks will be exposed and yes, I do get wind burned sometimes (weather conditions) and I do ski everyday. I will ski approximately 4-5 hours a day. Please help.........I have olive skin and am in my early 50s. Thank you, MInMadrid.