Well...it really depends on what you want mah....
Maybe not all of your family members prefer outdoor
activities?
Ever thought of:
:- Having a picnic with your family members?
:- Taking a stroll along the park/beach?
:- Flying kites? Rollerblading? Cycling? Swimming?
:- Play Bowling, Pool/Billard, Basketball?
:- La kopi @ Starbucks/Kopibean/whichever
:- Fishing/Catch crabs
:- Wine pubs/Holland V/chill-out pubs
:- BBQ, camping
:- Watch VCDs/DVDs, play videogames, board games, re-decorate your
hse/room with your family members?
:- Downtown East, Sentosa(Quite a few places in Sentosa), Pulau
Ubin, East Coast/Changi/Pasir Ris (FV) parks
:Science Centre, Jurong Bird park, Zoo, Night safari, Chinese
Garden, Botanic garden, etc
:- Holiday chalets
:- Wanna go chiong with them also can... 
All in all, i think it's how people plan or organise how they shld
spend free time with family members/friends....
Singapore''ll be a very boring place if we make it a boring
place....otherwise, i really don't see it that boring...Becoz we
make up Singapore lor... 