Wiring a light switch - too many wires!

I decided to change my wall switch from a dimmer switch to a regular single pole switch. When I took off the cover I saw that the existing dimmer switch had 3 connections - there were 2 black wires and one red wire. Since the new single pole switch only has 2 connections, I'm not sure what to do. My guess is to bundle the two black wires together and connect them to one terminal and the connect the red wire to the other terminal. But I'm way out of my league here and I have no idea what I'm doing.
The box has two sets of cables coming it. One cable has red, black and white wires (plus ground) and the other cable has black, white and ground wires. The white wires are connected together, as are the ground wires.
Any help with this GREATLY appreciated!
Thanks, Steve
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