I'm a "take the small camera" guy. I wouldn't even consider taking the DSLR to the parks, it's too much weight... FOR ME. And carrying it onto the plane, schlepping it through the airport, in addition to the laptop, and all the power cords, and other carryon stuff? Nope.
In the past, I've been very satisfied with the shots from my Canon G9. This year I took an Olympus E-P1 (micro 4/3), and I was also very satisfied with it. The most limiting factor of the G9 is the low light/high ISO performance; the G11 is better at that specifically, so you'll be OK if that's what you decide to shoot with.
But, I'm not you. All I can tell you is that the shots from the G series are pretty doggone good, certainly good enough for vacation memories. If you want those nice shallow shots with lots of bokeh, take the T1i or Photoshop in the bokeh.
In the past, I've been very satisfied with the shots from my Canon G9. This year I took an Olympus E-P1 (micro 4/3), and I was also very satisfied with it. The most limiting factor of the G9 is the low light/high ISO performance; the G11 is better at that specifically, so you'll be OK if that's what you decide to shoot with.
But, I'm not you. All I can tell you is that the shots from the G series are pretty doggone good, certainly good enough for vacation memories. If you want those nice shallow shots with lots of bokeh, take the T1i or Photoshop in the bokeh.