I realize I'm a little late to the party here, but I'll invite myself nevertheless.
Dante, you knew better than to have that little circle at the bottom green.
Admit it, you're quaking in your boots and are to scared to be online when ol' Petkal gets wind of this.
You should have called me. I would have sent you my 70-300 DO to use.
I looked at that 70-300 F4 at the show in New York. It's a toy. Yeah, an L-of-a-toy, but a toy.
I very rarely carry my 70-200 f2.8 around. I use it for shooting wrestling in a gym, night football. When I'm out and about, though, the guys I go with bring theirs, but they're a lot younger than you, and a bit younger than me.
So, where am I leading? You did the right thing. You got a nice tool/toy for your trip. You can take good pics with an instamatic.
Look forward to your results, you traitor.
I'm now wanting that 24-105 more and more. Heck of a lot lighter than the 24-70 f2.8. Maybe that's what you should have gotten. 
mark