Osage Park is another great option for playing pickleball outdoors on a beautiful day. Located in South Wichita, the park has 2 dedicated pickleball courts next to a tennis court. According to their website, there are restrooms onsite but I have yet to meet anyone who has used them.
The main downsides of this park – there are no lights and the courts are a bit far from the parking lot (similar situation to Edgemoor Park). However, you can park along Everett Ave (street West of the courts) and shorten your walk.
Osage park is a great option if find that all the courts at Seneca Park are full when you arrive. Osage is just a few miles South of Seneca Park and is an easy 10-minute drive.