100K FB miles isn't really that much - especially if you're looking for tickets for all four of your family.

For inetresting (and reasonably priced) award ticket ideas, you need to consider which SkyTeam airlines operate direct flights between BKK and their hubs. With VN and now several Chineses carriers in ST, your options to Vietnam and China may be good. Another 'interesting' ST route is KQ to NBO (Kenya), but awards come out at 70,000 miles (+ 265 Euros) for an economy return.

Also, I'm not sure if you can get award flights on Bangkok Airways (not ST but FB 'partner') - they may have some interesting destinations.

Good luck.

-- Henry