Considering that you are booking the most expensive possible day of the week (Saturday) to a popular spring break destination and that the fare is refundable, you have nothing to lose to book now and monitor the price. If you have a companion fare, use it as I’m sure most passengers on this flight will.

If you want to wait for the price to go down, you may have to wait until sometime in March if it happens at all. Alaska is likely to keep fares as high as possible as long as possible on this route.

If if you are able to book a different day of the week you’ll have a better shot.