Problem about visa to nicaragua

hello,everyone,
i'd like to learn spanish in nicaragua,and visit some beautiful landscape in this country,but i found that there isn't a nicaraguan embassy in my country-china.so i can't go there.please tell me how to figure it out?
by the way,i don't want to get the visa by going to another country.i wonder whether i can get my visa when i get nicaragua in the airport?
thanks