We took a combination bus,maas river and St Pietersberg tour. The scenery was excellent. On the bus we were handed an English printed copy of the bus tour. The driver explained points of interest, BUT where in dutch. In the caves, the guide could speak English and told us we could ask questions. The complete tour was in dutch. Great if you come there. I was born in Limburg and nolonger speak or understand dutch/limburgs (pity). While I asked a few questions the main theme of the tour lost. I could only understand a few words here and there.
Can I suggest that a pre-recorded device could be offered with different languages, like is done at many tourist attractions.
PS: we entered at the river end.