Make your own Sponge Water Bombs (alternative to water balloons). Cut sponges in strips crosswise, then stack 4 wide, 2 deep and tie very securely in middle with fishing line. Soak, play, have sponge water fight!
Life size Lincoln Logs made out of pool noodles~ 15 pool noodles from the dollar store, cut in half, cut notches out easily, with scissors = hours and hours of fun playtime! These were my favorite toy as a kid, love the life size!