Meh, not an issue really. There are different types of vampires, even daywalkers, though I'd like to maintain the sunlight weakness. At least until I earn the daywalking ability, assuming it's an option. As already said, hats. Also, sunglasses, sunblock, parasols, and might force you to be a bit modest to cover more skin during daylight hours. Meanwhile, being out under the sun can increase things like stress, trauma, fatigue, and pain. Especially pain, it should definitely be painful for a vampire to be out under the sun. Also, considering I think vampires are living in the temple, I don't think crosses and holy places are a problem for DoL's vampires. In other words, I don't think DoL's vampires would be the soulless and cursed type. Which means we should still have a reflection. Doubt running water is an issue, but garlic apparently might be if Kylar's parents are anything to go off of. However, Kylar's parents seem to have something wrong with them, so may not be DoL's typical vampires.
I'd expect possible penalties for being out during daytime, and bonuses for nighttime. Weaker during the day, stronger at night, maybe? That would make it easier to beat off assaulters during the night. Which is pretty handy, considering a lot of issues seem to arise at night. I don't usually go out at night in DoL, too much trouble. I might have to as a vampire, though. We need to feed, right? It would be easier to do so unseen at night. After all, can't let people know we're a vampire, right? That's no bueno. We should definitely be required to maintain secrecy on that. Maybe be punished by the vampire temple if we're not being a good cautious vampire? Maybe even attract a vampire hunter? Oh, I hope we can feed during sex. That's always a good way to sneak in an unnoticed meal. Biting during sex is fairly normal anyways.