No, they're separate entities and basically walled off except for buying Early Bird and checking in for a flight.
Inside 24 hours, you could have cancelled your flight and gotten a refund, but after that, you can only bank the travel funds. But you can't use travel funds on Southwest Vacations, you'd have to lay out new money.
Best thing to do is probably log into the regular Southwest site and poke around. Or like Fuzzy said, click on a link in your confirmation email.