I think it is a good idea to take a walk after dinner.
我认为饭后散散步是个好主意。
I think it is a good idea to read a book before sleep.
我认为在睡前读读书是个好主意。
I think it is a good idea to see a film after long time work.
我认为长时间工作后看部电影是个好主意。