For someone with passive understanding, the best resources are comprehensible input you can mostly follow (graded readers, podcasts for learners, Dutch TV with Dutch subtitles) plus regular speaking practice to reactivate production. Skip beginner grammar courses; focus on vocabulary retrieval and sentence formation through daily use. Combine free and paid tools, and prioritize speaking before your trip.

Start with input at your level. Since you understand a lot, choose materials where you catch 70 to 85 percent. Dutch children's books, graded readers, and news in simple Dutch (NOS Jeugdjournaal, Zapp) work well. Podcasts for learners, like those from language schools, help with listening. Watch Dutch shows with Dutch subtitles to link sound and spelling. Avoid English subtitles; they let you tune out.

Reactivate vocabulary and grammar. Use spaced repetition for words you recognize but cannot produce. Make your own cards from shows and books. For grammar, a concise reference like "Dutch Grammar You Really Need to Know" is enough; you do not need to relearn rules you already internalized. Write short daily sentences and get corrections from a tutor or language exchange partner.

Speak early and often. This is the hardest part but the most important. Book a few sessions with a tutor who specializes in heritage speakers, or use a language exchange app. Ask your mother to speak Dutch with you again, even briefly. Practice common travel scenarios: ordering, asking directions, small talk. Record yourself and compare with native audio.

Use structured courses selectively. Online courses like Dutch Grammar or Dutch Fluency can fill gaps, but they may feel too basic. Evaluate by checking the sample lessons: if you already know most of it, move on. A tutor can assess your level and design a plan.

Set a realistic routine. Aim for 20 to 30 minutes daily: 10 minutes input, 10 minutes vocabulary, 10 minutes speaking or writing. Before your trip, do a few mock conversations. Expect passive understanding to return quickly; production takes weeks of consistent practice. Be patient and celebrate small wins.