[red cuillen]

Summer holidays can be £600-900, but guess you can pick them up cheaper if you keep checking back. We did 5 days at disney at Easter and loved it, though first and last days were only part days. Much prefer DCL to WDW, you'll have to like riding the same rides over and over mind. KnottsBerry is close by, easy to uber/lyft to get to, and defo recommended as you seem to have young children. If you do decide to expand the holiday then read some trip reports, plenty of options, San Diego would probable suit your family.