As was already said- plan on inclement weather and taking some time to reach the top. The road has been improved over the years, but if you don't like heights (no shoulders in places and a wonderful of your impending death should you drive off), you'll pucker up a bit. I don't like them, but still drove it, so it's not THAT bad. Think Ozarks on steroids. Also start the ascent up with at least 1/2 tank of fuel. I don't remember how many miles you drive to reach the top, but they claim you'll use about 80 miles worth of fuel.
I alternated from first to second on the trip down with just a little poke of the brakes in the switchbacks. There are many turnouts- use them to cool your brakes and enjoy the views and photo ops!
If you're considering the "Cog" train, RESERVE NOW! It's incredibly popular and was booked when we thought to try it. Parking is an experience in Manitou Springs.
Also flatlander... Drink water. Lots of it- on your trip to CO Springs, and during your visit. If you don't, the altitude will not be as kind. Also try and avoid foods that may give you gas. During the ascent into the CO Springs area, and later up to Pikes Peak, there will be a pressure differential and you and/or your significant other will be quite uncomfortable.
I don't know what your state of cardio fitness is, but CO Springs is somewhere around 6k feet and will tax you some. Pikes Peak WILL strain a lot of people. When I went there was someone getting loaded into an ambulance at the ranger check in station and several people gasping for air at the summit. My wife was strained a bit at the top, while I had zero issues. So don't plan on playing a game of tag unless you're in top cardio shape.