Nidan is the best grading in the school. None Of the preassure of Shodan or Sandan( being the last). It's all freestyle ( except for the weapons kata) . Enjoy !
I miss nidan because, in my organization, its the last test where you are just doing standard techniques. you can pretty much do whatever technique you want, from a list of attacks. Sandan you are pretty much limited to henka waza and yondan is mostly kaeshi waza, whereas fifth dan is typically just a demo at, or teaching part of a seminar.