Legoland, Windsor (Berkshire)
We have visited Legoland several times and for us the enjoyment of the day depends on how busy the day is. On a quieter day (which is still busy) it makes a fantastic day out so I strongly recommend trying to go during term time. Legoland would rank much higher in this list (top 3) if every visit was guaranteed to be one of the quieter days as it’s the extremely busy days which ruin the experience.
If you’re going in the school holidays (even when the admission numbers are restricted because of COVID19) then be prepared for not getting on and doing everything (unless you qualify for or have purchased fast passes) and maybe all chose one thing each of you would like to do with the view that anything else you fit in is a bonus.

On our ideal visit we’d get to make full use of the splash park (swimming costumes recommended, changing areas provided), visit the Lego Model Village (lots of famous landmarks have been recreated), visit the Duplo Valley and explore the rides there (all toddler friendly), visit Heartlake City to see the shows, plus visit the Driving School (really looking forward to returning when our little one is old enough to go on the big one, as it looks really fun but she’s always been happy on the little one), ride on Coastguard HQ, Fire Academy (ideally you’d have two adults for this ride or at least an older child who is happy to graft) and last but not least the Lego Deep Sea Experience.

There are various cafes/kiosks around the park but I generally prefer to take a picnic so I can’t comment on whether they are any good (they look like the generic sort of places you get at theme parks). There are plenty of toilets and changing facilities too.
Cost: £49 each on the gate or cheaper if booked online. Cadbury’s often run promotional packs for a free ticket with one purchased ticket. Since COVID19, these are valid for online bookings as well (see Cadbury pack for instructions).
Website: https://www.legoland.co.uk/
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