We went last year when Seth was just 6 weeks old. We had heard a lot of negative comments about Bali and arrived there worried about pick pockets, bombs, bali belly and scammers.
By day 2 I felt safer there than I did in Australia

. The people are so friendly and the entire trip went without the slightest hiccup. Not one of us even got sick.
I kind of wish we where going back there instead of New Zealand later this year, but we always said we'd finish off the South Island (haven't even started on the north yet)
The thing I liked about it was it was a completely different culture but not too far away. I've found with young kids we are really limited to 5-8 days travel time because it does get too much for them. Having to spend 12+ hours there and back with for an 8 day holiday isn't worth it. Bali (from Melbourne) was 6 hours there and 5 hours back.
I really want to go to Thailand also. Never been there, so can't compare them.