Hi! I am a pale, blue-eyed American & I burn very easily. My eyes are also very sensitive to the light, so I’m always wearing sunglasses, even in winter. I think a couple things are important to keep in mind. The Environmental Working Group (EWR) has a ton of information & ratings about sunscreen that I always use. http://www.ewg.org/sunscreen/
I am personally a fan of Badger-brand sunscreen for myself & my kids, and the EWR rates them very highly. You should put about a shot-glass sized amount of sunscreen on your body - I typically put it on myself & my kids once we are dry & dressed, but before we go outside. You shouldn’t feel too sticky, but if you do, stand in front of the fan or air conditioner, or even wave a piece of paper over your skin to let it absorb. I only put it on areas that our clothes are not covering, but if we had a thin strap - like a tank top or bathing suit top, I do it all over the shoulder, including under the strap.
A good hat is also a great plan. I have not tried these products, but there are items that you can buy in advance and wash your clothes in that provide extra SPF - https://www.amazon.com/Rit-Sun-Guard-Treatment-Protectant/dp/B0000Y3F6W/ref=sr_1_2?ie=UTF8&qid=1497472342&sr=8-2&keywords=sun+guard+uv+protectant
Don’t forget the tops of your feet, tops of your ears, your scalp, shoulders, nose - I know these have already been mentioned but it’s easy to forget some spots when you aren’t used to wearing & applying sunscreen.
Depending on if you are a “sweaty” sort of person (nothing wrong with that, some people are more prone to sweating), you might even want to check out something that a lot of people recommend on park trips - Frogg Toggs. I have not tried them but they are cooling towels that help keep people cool. https://www.amazon.com/Frogg-Toggs-Chilly-Cooling-Towel/dp/B00IAUZ3LS/ref=sr_1_3?ie=UTF8&qid=1497472568&sr=8-3&keywords=cool+frog
Good luck! I think being aware that you should be proactive about sunscreen is the majority of the battle.