At the port-of-entry you must present:
If returning from Canada, Mexico or adjacent islands (except Cuba) after a visit of less than 30 days solely in those countries, your visa need not be valid; however, you will be required to show your previously issued I-94 in addition to the other documents listed above.
Students outside the U.S. for more than one semester and those on Optional Practical Training (OPT) may have additional requirements.
If you are in legal status when you finish successfully your program at HPU, you will have a 60-day grace period to depart the U.S. This grace period will be shorter if you do not successfully finish your program in lawful status.
During the grace period, you will be able to remain in the U.S.; however, you will not be permitted to leave and reenter the U.S. on your F visa. The only way to reenter the United States will be to do so on a visitor visa (although students from countries that participate in the Visa Waiver Program will be able to enter the U.S. from the western hemisphere without a visa).
Read more about the Visa Waiver Program.
Read more about travel on an F visa.