we hold Singapore passports and are entitled 15 days of staying in China without visa. in order to stay for more than 15 days, we plan on going to Hong Hong or Macau and returning to China immediately to get another 15 days.

question is - what's the most convenient way if we are not interested in staying in Hong Kong or Macau at all.

1) lo wu. i was under the impression that lo wu (Hong Kong side) is connected to the train station, and we will have to take the train once inside Hong Kong. a waste of time and 20 hkd.

2) shen zhen bay. no prior experience at all, but suspect it can be done.

3) gong bei (to Macau). no prior experience either, but suspect it could easy as it's less crowded.

can anyone give suggestions? thanks.