On select days throughout the year, the general public can go fishing for free. (Meaning you can fish without purchasing a license for your state. Note that Hawaii offers free fishing year-round; however, you'll need to supply your own airfare and hotel.) Most free days are during the summer months, but in some states they're offered as late as November
Note: Individual states may have certain restrictions and other regulations that may apply; contact your state fish and wildlife agency for specific state regulations.