If you go the Nikko and Toshogu with a large tourist group, this review will be of no use to you. But, if you go alone, first of all, go early in the morning, hopefully before the tour buses start to pour in. If you have the time and the interest, I highly recommend the audio guide. I can testify that the English, Japanese and Chinese audio versions are all equal and excellent. I'd go to Toshogu first, but also then go the the Daiyuen (I hope I've spelled that right), the much quieter and less visited but in some ways both easier to see and more splendidly decorated. As of April 2015 there is still major reconstruction going on, so be sure to climb the steps to the left after you get past the first two or so small shrines, or you'll miss the main Daiyuen funerary shrine. Then, after lunch, go to see the nearby (a bus ride or a medium walk up the hill) to see the Tamazawa Imperial Villa. It is not mentioned in any foreign guide book I've seen, has even few Japanese visitors (except those who know to come), and few Japanese have heard of it either. It may be better than the other "imperial villas" that are open (with much greater planning) in Kyoto. So, get to Nikko late one afternoon, you can see Toshogu, the Daiyuen and Tamozawa Imperial Villa, bed down and leave the next morning. I recommend the small (near the train station, on the left as you start up the main street) Sotto Voce for lunch, but there are other in-town dining facilities, including an interesting looking veggie place near the bridge.