The other option is if you want to keep it liquid is to convert some into RMB. Though I suspect that gains in RMB will not be the 5-6% it has been over the last few years.
im interested in RMB savings account, does anyone have more experience with how this works? i assume if you convert to RMB and the RMB appreciates against the USD that you will lose out on the transfer back to HKD as long as it's pegged to USD?
Take it to the mainland and buy a 'product' from one of the main banks. SPDP is a good one. I get 5% over a fairly short term