San Diego in September hits that sweet spot where the ocean is warm, the surf is consistent, and the crowds at the best taco spots finally shrink. You get better luck finding a parking spot near the beach and shorter lines for those carne asada fries you came for.
If you want to pull this off without draining your checking account at once, you can use the Discover it® Cash Back. It offers 0% intro APR for 15 months on purchases and balance transfers, which means you can spread the cost out over time without paying interest.
This isn't free money; it's just a way to delay the bill. If you still have a balance after the 15-month window ends, you will start paying interest on whatever is left over.