Yes, I bring a red rear light, but I usually only use it if it is gloomy, foggy, or heading toward darkness.
And I often ride with a hi-vis yellow jacket or vest.
Not a tour, but last Sunday we decided to cycle up one of the local mountains as a training exercise. A lot of tourists drive up there and the road is quite narrow. I opted to wear a hi-vis yellow jersey in the hopes of being more easily seen.