Along the road that goes to Maracas Bay from Port of Spain, after the summit, Fond Pois Doux road branches off upwards, steep on the left side (it would be best to park here). From here you have two options:
option 1 : from the Fond Pois Doux road, hike up about 15 minutes until you reach a gated drive that goes to the right. Take the right and start the long steep walk down. Stay on the paved/gravel road until the very end. Near where the road ends and you can hear the ocean waves, watch for a path that goes to the right. It will have red markers every ~50m on the trees. This will put you on the east side of the cove.
option 2 : from Fond Pois Doux road, hike up to the very end of the main road (this may take ~45 minutes). When the paved road ends at a "T", take a right and begin your walk down. At the very end of the paved road, the jungle path begins. When you get to a small shed on the path, just before that, you should go to the right down the path with red markers every ~50m on the trees. This will put you on the west side of the cove.
If you've read this far and would like to go, but don't think it prudent for yourself, you can drive up Fond Pois Doux road and at least take in a couple nice panoramic views!
If you make it this far, or at least if you are reading this, see if the eco-tours or bird watching at North Deck are of interest (http://www.thenorthdeck.com/)
Equipment: Caution : both options will be +/- 1.5 hours one-way and involve very steep hills, so are for physically capable people. The path can be hot on a sunny day and humid on a wet day. Bring water, sun screen and insect repellent. Both the road and trail can be slippery when wet due to moss, fallen leaves and mud/clay. Bring proper shoes.
If you visit during high tide or when the surf is strong, you may need to wade through water to pass the entire length of the beach.
Whether from the surf of possible rain, plastic bags to protect phone/camera are advisable.
You can lead yourself on this or other adventure/sports activities. Or you can call Arleigh Deane (phone below), as he is a guide for all types of activities.
If you have access to your own vehicle and want to get off on a less traveled hike and have an opportunity to see a cave, Aripo is the ticket.
The windy road up to Aripo Village offers a nice break from the flat valley. The jungle canopy slowly envelopes you as you climb.
The road will ultimately end above Aripo Village. At this point, the cave is ~2hr hike up the mountain. However, there is no marked trail.
When you enter Aripo Village, look for Hill View Mini-mart. There will be a sign near here where you can hire a guide. The guide will then escort you up to the end of the road and along the hike.
I cannot speak for the price of the guides since this was coordinated by a local friend of mine.
Equipment: From the end of the road, it will be about a 2hr hike up the mountain. Trail can be slippery so bring proper shoes. Guides may provide flashlights, but does not hurt to bring your own.
To be honest, there isn't much to do. You can surf the waves (if you have your own board) or travel the island in a jeep. Apart from that, the laid back lifestyle means that the beach is the only real thing to do.