If you really want to experience the natural limestone caves and the mangroves - then do go for it. But remember - it is a very long travel. You will spend more time on the road than actually in the destination. First you will go by road till the forest reserve area, you will need to fill up forms there - if you don't reach on time, you will be behind a long queue of cars. There are a few small snack shops here (you can grab some breakfast & tea here, and even get some packed for the long day ahead of you). Next, you will pass through the dense forests area - which houses the 'JARAWAS' tribe, but seeing them is extremely rare, so do not go with high hopes. Then you will have to travel by a big boat across a river - and then by a small boat from the jetty to the mangroves. From the mangroves, you will have to walk about 2kms through forest and fields to reach the limestone caves. It is definitely a unique opportunity for city dwellers to experience this - but prepare yourself for the long travel. The travel to and back will cost you the whole day. Also, once you are back from the mangroves/caves, you may need at the jetty area to board big boat. This area is not very clean, crowded and the waiting area has less seating space (to top it, tired tourists lie down on the benches, not even leaving enough space for other people to sit. Once the big boat arrives, you are herded on to it like cattle. All said, riding in the boat through mangroves was a unique experience - something you will always remember.