1. Turkey Lake
2. Barnett Park
3. River City Nature Park - DeBary, FL
4. Rock Springs Ridge - Apopka, FL
Turkey Lake & Barnett Park are the 2 obvious choices right in Orlando.
Airport Lakes is ok, but don't choose Airport Lakes over Turkey Lake or Barnett Park.
If you have time, try to make a trip up to River City Nature Park in DeBary (30 minute drive north of Orlando). The course is on a very scenic property and is coming along nicely with 9 more holes added a few months ago. I help run the club and we move the baskets every 6 weeks with 3 - 5 pin placements on each hole allowing for LOTS of variety. We are currently saving up for concrete teepads for the next 9 holes (almost at our goal!) and we are shooting for this month or by January to have at LEAST the short pads completed. It's a work in progress but is quickly becoming a local favorite. Disc golf is the only thing in the park and disc golfers will be there in drones by late afternoon. It's basically a big disc golf hangout all day, packed full of locals and visiting players alike. There will surely be several gang golf groups out there, but they are usually friendly locals and should let you play through and/or help you find your way around if you need help. Once you've played the course through, it's easy to remember the layout which doubles back to the parking lot after each 9 holes.
Rock Springs Ridge is ok as far as the design, but a bit pricey in terms of what the Rock Springs management expects disc golfers to pay. The executive course is too short and easy (but perfect for beginners) and the championship course, while a worthy challenge, does not get the TLC you would expect from a pay to play venue. The carpet teepads are now in terrible shape and no concrete seems to be in the plans. I would say that the folks running Rock Springs Ridge need to talk to the people running Pine Oaks in Ocala so maybe they can learn a little something about making a pay to play course attractive to players. Rock Springs has potential, but right now, as is, there are much better free courses to play in the central FL area.