My favorite place for a romantic evening in Kyoto is on the riverbanks of Kamo River: if you cross Shijo-ohashi, the bridge close to the famous Minami-za Kabuki theater, you will see a string of ochaya and traditional restaurants, with balconies opened towards the river.
It's a very romantic place, especially for a summer evening, favored by couples but also by anyone who enjoys the freshness of the river water. You can stroll alongside the river admiring the beauty of the traditional buildings, I saw a spot where you can even cross it if you dare, and if you get tired, those friendly restaurants await you...
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 55mm
Aperture: F/7.1
Shutter Speed: 1/30s
ISO Sensitivity: ISO 500