Congratulations. It will be worth staying sober (just about enough) at your son's ceremony in order to enjoy the occasional drums that punctuate the Shinto marriage, which will include an awful amount of sleep-inducing recitation. Best thing will be the little dish of sake that the couple are given to drink in turns in the cool 'temple' (!). Later on, be prepared for some karaoke just after the meal and for chrissakes don't mention the Ainu! :-)
I would recommend to you, if you are in Asuka, the great megalithic monster of Ishibutai, one of the best things in the area Nara-Kyoto. A long walk around the place will be very fruitful, as there are stones and kohun all over the place. If you can go back to the early posts of the Modern Antiquarian, you will be able to find long threads with descriptions on the place and its stones galore.
Enjoy. And yeah, spring should come soon, it's been a really miserably wet winter. Haven't seen a ray of sunshine in two months of constant 24-hour-rain.
XXX
GP