If you are into climbing, when the weather is nice you can climb those silo’s you see from the interstate that have the changing art work on them. There is a group that usually gets together on Sunday, the provide all of the equipment and everything, it’s pretty epic, and beats a rock wall.
I'd definitely be in for some rock climbing if the price and schedule was right.
I work at UNO, but don't have a gym membership there (it costs a lot per month). However, I do have a faculty/staff ID card, and could attempt to get you in as guests for the $7 entrance rate. I took a yoga class there last semester and had sign-in permission to the facility for class time only, so some of the desk workers might recognize me - not sure if we would be turned away at the door, though....
I go to the UNO rock climbing wall regularly (and am not a student or staff). The wall is the only part of the gym that is open to the public without the requirement of being with a student or staff. It costs $7 per entry. Once in the gym you need to take a belay certification class or test out. The class and the test out are the same price (I think $10) and you need to at least test out every semester. There is also additional cost for renting equipment (like $3 for shoes and $5 for a harness and $1 each for a carabiner and belay device). There is no belay certification and no equipment (other than the recommended shoes) required to use the bouldering wall.
The silos are cool but there is some drama between the owner and the city of omaha that may result in no more climbing. You can read some about it on their facebook page "SILO extreme outdoor adventures".
I've been to lifetime fit a couple of times. Their wall is nice, but $60 a month (or more) membership for the gym if I only want to use the wall is steep and is all the way across town from where I live. UNO has a cooler wall (and a dedicated bouldering wall) and is pay-as-you-go which suits me well.