The base material (sintered over extruded), stiffness (stiffer = faster), and length (longer = faster) affect the board's speed more than camber profiles.
If you want a board for general cruising, you want a softer board. I would look at boards in the 4-6 range of stiffness on a 10 scale.
I actually think a rocker board or some sort of hybrid will be better for your purposes. The reason being that rockered boards are more forgiving. This means you have less chance of catching edges which is great for general green cruising. If you so do feel inclined to become a good carver, then a flat camber or regular camber will be the best route. A hybrid will give you the best of both worlds.
This one is not a big deal, but a directional or directional twin will be a good choice for you. True twins will work too, but since you don't sound like you'll be doing switch or tricks, directional boards will carve better (for the most part).
I highly recommend the Ride Promise. It's a great female all-mountain board with slightly more than mid-flex. It has a very mellow LowRize rocker which gives you that catch-free playfulness without being too loose. The flex is perfect for your type of riding.
Dunno if this is your size, but take a look.
Ride Promise Womens Snowboard 2011
The GNU B-Street is another good choice. This one is a twin, but carves nicely because of the Magnetraction. The biggest benefit of Magnetraction is icey conditions. It will carve on ice without a problem.
Gnu B-Street BTX Womens Snowboard 2011