I visited the Caves of Maresha and Bet Guvrin the day after I arrived in Israel. The flights from the Netherlands arrive passed midnight and the next day i drove from the airport to Jerusalem but first visited the Caves of Maresha and Bet Guvrin.
It's a nice park; and best to go around by car. The Roman parts are outside the park and free to visit. In the park there are 4 places to park the car and see the caves around there.
It looks small if you're at the entrace, but once you go underground some complexes are very big. I really enjoyed my visit. Do take a pick nick lunch! Lots of places to eat but not much available in the park.
Recommend to go from Tel Aviv or Jerusalem; easily reached in a day by car. Photo's see the link below.