Assuming you meant 299 for the two of you, that isn't too bad a price for flights.
As for the hotel, it does depend on what board you're looking for. For Bed & Breakfast, I've found it for the same dates for £600.23 which would mean a £25 saving on Alpha Rooms. However it goes up to £674.54 for Half Board. This was on Travelrepublic.co.uk.
Also on Travel Republic, I managed to find it for £528 (£594 for Half Board) for departing on the Sunday 29th - April 5th, although baring in mind there will be a greater amount of flight options available on the Tuesday so it could work out more expensive overall. For a week including the 4th, it does seem to be cheapest to depart on the Sunday (29th), gradually getting more expensive as you work towards the school holidays. However as I say, Tuesdays and Fridays will offer the greatest choice of flights, and therefore may prove to be cheaper in the long run (although having looked on Monarch, there doesn't seem to be that much difference between the Sunday and the Tuesday, depending on where you're departing from).
Good luck!