With that in mind, Missouri I-29, Exit 1E. Old Pike CC is close as well.
I'd also recommend:
KS I-35 - exit 128, Jones & Peter Pan Parks in Emporia.
KS I-70 - exit 157 (US-183 bypass), Frontier Park in Hays.
KS I-70 - exit 252, (9th Street) Thomas Park in Salina. Lakewood Park is nearby as well.
IA I-80/35 - exit 131 (Merle Hay Rd.) - Walnut Ridge & Big Creek S.P. near Des Moines.
IA I-80 - exit 244 (Dubuque St, County Road W66) - Peninsula Park, Turkey Creek and Sugar Bottom in Iowa City.
MO I-70 - exit 21 (Adams Dairy Pkwy.) Wilbur Young Park in Blue Springs, MO. Legacy Park in Lee's Summit and Lake Shore DGC in Pleasant Hill are close by if you continue south.
OK I-35 - exit 110 (Robinson St.) Griffin Park & N.E. Lions Park in Norman, OK.