As a side note I wouldn't bother going to Yakushi-ji and Toshodai-ji; I found both were over-rated and rather uninspiring. The latter is also undergoing an extensive reconstruction project. Houryu-Ji is worth it for the fact it's the oldest wooden structure in Japan which is some achievement considering how many temples have burnt down several times throughout their long history.

Heijo-kyo palace is a little out the way from central Nara and if I'm deadly honest I found it disappointing. The whole building is a reconstruction from the ground up and consequently it failed to convey a sense of antiquity. It's kind of in the middle of nowhere too but you can see it from the train if you ride the kintestu line to Nara koen.

Anyway, that's enough from me. Have fun on your trip and don't worry too much about manners etc. As long as you weren't born in a barn there is very little you could do that would upset them.