days out, tried and tested
One outdoor activity spot is listed in Nieuw-Vennep so far, which is a short list and we say so rather than padding it. The nearest other towns with outdoor activity spots listed are Oegstgeest (one) and Halfweg (one).
1 outdoor activities in Nieuw-Vennep

Nieuw-Vennep is one of the towns this directory covers, with one place listed across every category so far. It is about 22 km from Amsterdam, so a day out here is usually combined with one there.
Weather in Nieuw-Vennep
1 of these are pinned above. Tap a tulip to open the listing.
The one outdoor activity spot in Nieuw-Vennep is not free — it charges for entry. 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, and the listing links through to the venue's own prices.
Of the one outdoor activity spot here: free parking 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 outdoor activity spots of their own are Oegstgeest (one, about 14 km away), Halfweg (one, about 16 km away) and Amsterdam (eleven, about 22 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.