Zandvoort has the benefit of being in a small, densely populated country with decent public transport. So you can stay at a hotel in some less touristy or obvious city and still get to the track in maybe 2 hours and see some Dutch landscapes from the train (it’s a bit boring to me, but it’s always nice to see another country). You can then visit a city like Amsterdam (for museums and the tourist traps), Dordrecht or Leiden (both more authentic and beautiful cities. Also less tourists, so I should tell you this and change that) in the days after the GP when the hotel prices there are back to normal.