J.B.
Hi S., there isn't a splash park in Plano. Can you believe it, we have everything else! There are several I can recommend though. One is in Allen off of East Main called Celebration Park and there is another at Finch Park in McKinney that we LOVE. There is shade and two climbing structures as well, so lots to do! There is another in Eldorado(McKinney) called Aviator and you may want to look that one up but I haven't been there so can't give an honest opinion. Blessings, J.