You can go to the semi-Shan Yu swimming pool, which is good, but it is open-air and not expensive. You can buy swimming necessities at all prices. The address is in Dongshan Development Zone. Don't feel far away as soon as you hear the development zone. Yichang is not big, just cross the tunnel into the city. You can bring your own bathing suit and swimming cap. There is no extra charge. Have fun!