is there any tour from HK to shenzhen and guangzhou for 1-2 days each and the tour speak english ?

hi,
does any one can help for the information since i plan to visit HK by end of this month, but i would like to visit SZ and Guangzhou as well. any trusted tour who speak English from HK to visit SZ and Guangzhou like 1-2 days each ? if yes, can i get the contact details and cost ? should i order in advance or better when i arrive HK ? thanks a lot before