I am starting to see fine lines around my eyes and nasolabial folds are kicking in. So I began using Retin-a early this month (Dec 2014). Every summer I go to Hawaii. I'm afraid that I will have to stop my regimen and start all over...I don't think sunscreen is going to be enough to protect me. Must I stop my regimen before my two week trip to Hawaii and If I do, will it be like starting all over again with the Retin- a process? Any advice or tips on how I can keep going despite sun exposure?