There are all kinds of things to do outside of going to the parks. There is, of course, Disney Springs. Offsite there is Gatorland, There is an airplane Museum in Kissimmee, along 192 are a plithery of mini golf and gift shops as well. There used to be a huge flea market just to the east of WDW and next door helicopter tours as well. International Drive has all kinds of novelty things. Most have fees but compared to WDW they are practically paying you to go there. Just to the west few miles away is Bok Tower. I loved it and all it was is a simple nature park with a very fancy bell tower that has scheduled concerts during the day. I just found it to be another world. It was quiet, and restful. I even fell asleep while sitting on a bench under a live oak and Spanish moss. Going south on 27 there is a candy shop that specializes in Florida citrus related candy, but also chocolate. A little further south is a huge orange processing plant. I think it has tours as well, but all I needed was to drive past it and smell the orange blossoms and processing.
If you are thinking about another park besides Disney there is Universal, Sea World, and Legoland. (once was Cyprus Gardens) And the biggest real thing is just 60 miles to the east called the Kennedy Space Center. That is a must see as far as I am concerned. Just standing in the building under the Saturn V Rocket like the one that took men to the moon is something to experience. You have to see it up close to get the real feeling of just how big that thing is. The cost is comparatively small compared to other places, but fascinating. I'm sure there are other things like 60 miles west in Tampa is the Sunshine Bridge plus your usual tourist traps.