Welcome to the forum. Your screen name is very fitting if you want to go to Hawaii! I love it there....
I don't have a lot of experience with discoid Lupus. Mine is pretty much strictly SLE. But, I have found that even in the warm, tropical locations, if I stick to the shade, I do very well! When I vacation, I wear hats, and I tend to stay relatively covered up. But not to the extreme. Truly, as long as I have shade and sunglasses and my hat, sunscreen, I do just fine. The shade is the biggest, most important thing for me.
I guess you won't really know how you'll make out unless you try it! I'm a real advocate for just doing it! But with precautions and knowledge. If you really want to go to Hawaii, plan it. Go for it! Life is too short!
There will be other members with more tips for you too. OH. You can buy cotton clothing that has UV protection in it. I'm not sure where you can get it, but I know it exists. That's a good thing to take too.