How long is your stay and how many times are you planning to cross into HK during that time? Keep in mind that for those using a passport, they earn four stamps for each roundtrip. And from Lok Ma Chau or Lo Wu, it is still 50+ minutes to Tsimshatsui and over an hour to Central. Add the time at the crossing and commute between hotel and the border, you're spending 3 hours on mostly crowded trains each day. Is that okay for you and the kids?