It looks like I will be able to attend Dinner on Saturday! I have changed around my flights by a day, and I will arrive at Changi at 20.15 on the 13th from AKL on SQ 286. I have just enough time for Dinner (4h 50min layover) before I continue from SIn to ZRH on SQ346.

So, I strongly vote for Geylang, this will allow me to spend an additional 30-45 minutes with all of you!

Can anybody advise whether traffic would normally be a problem getting from Changi to Geylang?
It seems the MRT is 7 mins travel time for the Changi Shuttle + 11 mins for the ride to the Aljunied MRT stop. This in turn seems to be a 500m walk to the hotel. So, if traffic would be a problem, I'd take the MRT. If not, I'd opt for a taxi as a route planner is telling me this is a 15km ride taking about 15mins. Including the 5$ Changi surcharge on a Saturday evening I would expect to pay about 15 SGD for the cab - which seems fair enough.