Bronze cross? I did that when I was 14. Check parks and rec. If you just want to recertify you can probably find a weekend course coming up soon.
If you want it for lifeguarding you should really consider taking your National Lifeguard Service award. And probably a CPR course. I know when I worked for the City of Toronto we got more money for having our CPR, and you couldn't get hired unless you had your NLS.