As a couple, Keukenhof (seasonal) works.
When it's open it's genuinely jaw-dropping — a sea of colour that lives up to every photo. The fit read is about crowd tolerance: people who are overwhelmed-in-a-good-way by sheer floral spectacle love it even shoulder-to-shoulder, while anyone who wants calm finds the peak-bloom weekend a crowded photo-op. The cheat code for the second type: the surrounding bulb fields are free, blaze just as hard, and are far better seen by rented bike from Lisse than from inside the gated, ticketed garden. The catch: it's open only ~8 weeks a year.