This year's parent and toddler offer looks a good one! 1 adult and 1 child under 6 get in for £15 (normal price would be £72.60.) Follow the link and press 'Buy now' to see the details of the offer.
It is only valid on Monday - Fridays during term time (dates below) but this is a bargain way to take your youngsters to Legoland. Under 3s are normally free so I guess this only works is you have a 3, 4 or 5 year old (although this is less than half the price of just an adults ticket so worth buying for a 0-2 year old as well.)
9th, 12th, 13th May
27th June-1st July
26th, 29th -30th September