They would never have access to your SMS messages or usage anyway.
If you turn sycnronization off, and keep it off, then they won't know about your contacts or calendar entries either.
They can also get location from the MAC address of nearby WiFi routers (these have been mapped along with Street View), or from your cell tower location (which isn't very accurate, but could place you within a 100m or so from where you are), or from GPS. You can prevent Google from knowing your location from any of these sources by unchecking "Share with Google" in Menu -> Settings -> Security and Location.
GMail? Well if you use that it's obvious what they know.
They may well know the MAC address of your phone too, so any time you access Google's servers they could associate that with your phone, but if they don't know anything else about your phone it's not a lot of use.

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. I just want to control 
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