This "sports park" is actually a building just off Muzha Road Sec 4. (A short walk from the MRT station.) It's not large but it does offer a place to take your children.
On the first floor, there is a play area with climbing equipment including a "rock-climbing" frame (plastic). It also has an outdoor play area and garden. (No eating indoors but there is a water machine in the indoor area). Some local moms I know have playgroups there, including small-group storytelling.
B1 is a swimming pool with 6 lanes. The two outer lanes are for free play/children swimming. It's a 25-m pool. Lanes are 2 meters wide, middle depth 140cm, either end is 120cm, temp is 29 degrees. Water is warmed up and chlorine etc checked every two hours. Water is completing changed once a month. There is extra heating next to the pool so you won't get cold too easily. Pool is open from 5:30am to 9pm, in 4 sessions: 5:30-7:20, 8:30-11:15, 1:30-4:15, 6pm-8:40pm. You can use floaters, swim rings etc for kids, but need to bring your own.
2F is a reading room and will later have a library. There is also a small gym, with 3 running machines and a couple of other things.
3F has two rooms which you can use for meetings, such as reading clubs or whatever you fancy.
This facility, including swimming pool, is free for residents of Wen-Shan district, Neihu, beitou, Nankang (Nangang), Shilin ("taipei area 5"). If you're not from these areas, you pay adult 110 or 80 kids (students, or under 110cm). Over 65s half price.
Address; Muzha Road Sec 4, Lane 159, No. 16
10 min walk from Muzha Line's Muzha station.
Take buses: 251, 252, 647, 660, 666, 902, 915, S10, BR3, BR7, get off at Bo Jia Elementary School stop.
Carparking in the basement.
Remember to take ID, and swimming caps if you use the pool.