Go ahead! Save a bundle this weekend on clothes, school supplies and computers when Tennessee drops its sales tax on those items from August 5 through August 7.

But Thomas Nitzsche of ClearPoint Credit Counseling Solutions warned shoppers should shy away from that smiling retail employee who approaches you with a clipboard, offering the store's credit card with discounts for signing up.

It's your safety net, your "in case of emergency" card.

But your credit card may end up at the center of your vacation crisis if you don't follow the advice of Ben Woolsey, director of marketing and consumer research for CreditCards.com.

These are Woolsey's five worst credit card goofs while on vacation -- and what to do to avoid them:

GOOF #1 - YOU DIDN'T NOTIFY YOUR CREDIT CARD COMPANY ABOUT YOUR TRAVEL PLANS.  "Unless you call your bank in advance, your card could be shut down or flagged for fraud and rendered unusable," said Woolsey.

Solution:  Call your card's customer service line and let a representative know you may use your credit card while on vacation and to mark your account for anticipated charges at or near that destination.

Tennessee is one of a handful of states taking part in a project to build charging stations for electric vehicles.

In Tennessee, the project is focused on the cities of Nashville, Knoxville, Memphis and Chattanooga. The project plans to deploy approximately 2,500 residential, commercial, and Blink DC fast charging stations in Tennessee, providing close to 425 miles of connected EV infrastructure. The layout of the charging infrastructure is designed to encourage consumer adoption of electric and provide transportation corridors between them to allow the electric vehicle to travel beyond its charge radius.

Click here for more information on ECOtality’s electric vehicle project.