Be careful with the prepaid Visa card. Restaurants generally will over authorize the card when they run it to cover a tip. This may cause the card to be declined. Just make sure that you have plenty on the card over the amount you will be spending at the restaurant and you will be fine. They are more difficult to use if you are spending more than the value on the card.
You also indicated that you were not going until September. You may want to check the expiration on the prepaid Visa cards. I know many start to loose value after 6 months of non use. If they do, you may want to use them for a small transaction in April or May to start the 6 month clock again. You may want to find out when they were purchased, because the 6 month clock starts when they were bought.