Some discounts are available, wether they've been released yet or not for that time frame I do not know. I think the AP rates were just very recently released, as I just booked our room 2 days ago. I got an AP rate for Jan. 10-15, at $119.00 a night. DON"T think you will get that rate in April though - the prices seem to be based on "seasons". I think April would tend to be more.
When I called to book our room, the reservationist told me that the ENT. rates, are not avail. as the contract had NOT been renewed!! So, I don't know if ENT. rates will become avail. or not.
As for now, If you have an AP, I'd check that rate, or if you don't have an AP, I'd keep watching, and maybe discount codes or rates will come out for the time you'll be there. Usually when they come out, it's posted almost immediately.
An AP rate is an Annual Passholder rate, depending on how long you'll be there, it may be worth it to purchase one. Even if this will be your only trip during the year. We live in La. and purchased them, when they had the add the 2nd year free deal.......... it saved us a TON of money..... well worth it with all the discounts the AP offers!!! Good Luck