Colorado Springs in early March

Most likely the weather will be iffy. March in Colorado is usually the snowiest month. I think most of the outdoor touristy stuff is open depending on weather. Pikes Peak won't be open until late spring.
There is the Air Force Academy, I think Cave of the Winds is open all year, that is pretty cool if you like that kind of thing. Anything hiking wise, again will depend on weather. The zoo is awesome. Seven Falls, Garden of the Gods... but again, weather?? LOL

We went in early April last year. Did Garden of the Gods and the Manitou Incline. The year before we did the Seven Bridges Trail. We drove down to Canon City and went to the Royal Gorge. We did the Royal Gorge train ride. That was fun.

Pike's Peak was closed both times we went in April.

A lot of quaint shopping in Colorado City, which is located approximately in the 1900 to 3000 blocks of Colorado Avenue. One place in particular is Michael Garman's Magic Town. It is a miniature city, sculpted at 1:6th scale and depicts the gritty neighborhoods of Garman's past - when he lived as a self-described vagabond, hitchhiking from town to town. It includes hundreds of original characters in intricately detailed buildings & brownstones, missions, back alleys and hotels.

Then, if you are driving west on Colorado Avenue towards Pikes Peak, you will come upon Manitou Springs, which also has many quaint shops. You can sample Mainotou Spring Water at 7 differnt fountains. Not quite as bubbly as it once was, but still makes good Koolaid.

If you like history;
WWII Museum
Glen Eyrie Castle
Rockledge Ranch
US Olympic Museum
Pioneers Museum

As other's said, weather is so iffy. Forecast is that the first week will be about 40ish, with the 2nd week being in low 50s. And of course that can change from day to day.

You do need reservations for the Manitou Incline now- Here's a link.

Our zoo isn't cheap, but it is so awesome! It is right on the side of the mountain. We have babies galore most of the time. The animal exhibits include lots of indoor spaces where you can get close and kind of personal with the animals. We have a newer exhibit of pelicans (they can walk right up to you) and hippos. The new baby, Omo, the hippo is kind of precious. As you go through that exhibit, you can walk outside and smell the goodness of a warthog or two. We've been able to touch their backs on occasion. Digger and Emmet, our grizzly bears do a little showing off around two and will come right up to the enclosure. My neighbor works in the North American exhibit and will let you pet a snake or skink or whatever is hanging out. If you look up, you'll see the baby sloth that makes his way among the rafters in the building. So many fun opportunities to see (and smell) the animals.

And March weather is mostly good. A nice snowstorm around spring break is sometimes in order. Today was 55 degrees and sunny and I had my air on. Even when the thermometer says it is supposed to be "colder," the sun really warms up the place.

For free stuff, hit the Garden of the Gods. You can drive through it in less than a half an hour, but stop and do a little light hiking( Siamese Twin rock) is super easy. It looks right into Pikes Peak. If you are up for majestic views on top of the mountains, hit 7 Bridges trail. It also has some pretty easy hiking if you stay on the road. On the way up to Helen Hunt Falls, you can pull off and do the Columbine trail(s) and these are all free places.

If you're up for pretty flat hikes, you can go up about five miles into the Pike's Peak Highway and just go to Catamount Lakes. It only costs $5 per person to just go to these lakes as opposed to maybe $20 per person to go to the top of Pikes Peak. Also amazing.

Manitou Springs or Old Colorado City (about a mile or two apart) are also small little shopping areas that are outdoors and fun to pop in if you have an extra hour or too. If you do get to Manitou Springs, stop at the Loop for a margarita. Food is fine, but the drinks are really good.