go down to one of the marinas, fish from shore around weeds with a worm and float, have at her. took my 4y/o out today, 3 hours, ton of sunfish and perch landed. she doesn't care about size, just wants to have fun.
i have a shimano ultralight noodle rod setup with 4lb test that we use, tons of fun for those little panfish, and the odd bass we get is a blast!