I'm in the Backcountry at the moment, the missions do seem to be far apart but I reckon thats to try and push up the driving stats for people that have rushed through the first city. It seems like a good change of pace to me, whoever designed the map has done a great job, it is like a "real-world".
When I was a kid I used to read in magazines, about games of the future, where you'd be able to walk around a world environment and interact with everything, this is getting close, and I think games like this should be pushed more, rather than the graphic-dependent first-person-shooters.
The missions, I reckon, have been alot more fun than Vice City, the one where your car smashes through the sign, and it shows the sign and because of some missing words it reads " The taste of . . . . . . . come. " with the picture of a girl gargling back some drink. I thought "I'm playing a Rockstar game."