days out, tried and tested
Two family days out are listed in Julianadorp so far, which is a short list and we say so rather than padding it. The nearest other towns with family days out listed are Den Helder (one) and Schagen (one).
2 family experiences in Julianadorp

Julianadorp is one of the towns this directory covers, with two places listed across every category so far. It is about 59 km from Amsterdam, so a day out here is usually combined with one there.
Weather in Julianadorp
2 of these are pinned above. Tap a tulip to open the listing.
None of the two family days out listed in Julianadorp is free at the moment — they all charge something. Free entry is tagged on a card the moment a venue offers it, so this answer changes with the data rather than with an edit. Each listing links through to the venue's own prices.
Of the two family days out here: free parking at one and wifi at one. Those are the facilities the venues publish themselves, shown on every card, so you can filter for the one that decides your morning before you set off. Anything not listed is simply not stated by the venue rather than known to be absent.
The closest towns with family days out of their own are Den Helder (one, about 8.4 km away), Schagen (one, about 12 km away) and Bergen (one, about 25 km away). Distances are measured between centres, so add the traffic. Every one has its own page here with the same detail, and they are linked at the foot of this one.
Measured between town centres, closest first.