I use Neutrogena Dry Touch sunscreen ... I like it better than others I have tried because it leaves my skin feeling normal and dry rather than wet and greasy like so many other sunscreens. You might try different kinds of sunscreen, they aren't all the same. I don't use the sunscreen on my forehead but I do use it on my cheeks, and especially my nose and ears. I second the recommendation to use a lip protection with a high SPF level.

I've also bought light, white arm "warmers" ... they are designed to be worn in the sun. I've only worn them a couple times so far and they are OK. You might also consider a light, white, long-sleeved, dress shirt or something similar. A dress shirt would be good because of the collar. The collar might prevent sunburn on the back of the neck.

I have a pair of knee warmers which I really like, and now I want to get a couple more pair. I tend to burn between about 10 am and 1 pm. Quite often it is still cool enough to wear the knee warmers until noonish, so that reduces my chances of getting a really bad burn on my thighs and on the back and sides of my knees.

I use a helmet and largish sunglasses which helps protect my head and eyes from the sun. I've recently picked up a couple helmets with visors which should be even better for next summer.