Check in 48 hours before scheduled departure time at Changi, then hopefully you will have enough time to sample at least half of all of the menu choices in the TPR.
TPR closes after last ex-SIN flight of the day (usually around 2am), you may overnight at F/J lounge as they open 24 hours. But I would suggest paying for the Transit Hotel for a proper bed.
Breakfast end at 10:30 so wake up early. Items for lunch and dinner is probably the same.
You may have a look at my photos here:
https://www.facebook.com/media/set/?...1&l=0b1a600243