My husband and I, Costaricans living in Sydney, Australia, will go to Japan through China.

Hi!
We have two questions:
1. Do we need transit visa if we´ll stay just 4 hours at the airport, on Feb 7, 2017?
2. On 19 February, we'll have 12 hrs layover and we want to go on tour. Wich type do we need to?

OR, which type do we need to stay 4 hrs at the airport on Feb 7, AND to go on a 8 hrs tour on 19 February?

Thank you very much,
Irene Salazar Carvajal and Fabio Jimenez Castro
Sydney, Australia