Bring money into China for a holiday

Hi,

I am going on holiday to Shanghai with my brother and sister--in-law next week and would like to take with me a large amount of cash for shopping and extras (about €30'000). It says a maximum of $5000 can be brought in, but if I were to bring in this amount, would I have to declare it; and if so, how much would I be taxed? would i face any difficulties?

Kind regards,

Max