Went with our kids (10 and 12 years old) in August of 2013. Our Guide, Oscar, was fantastic and kept the kids interested in-- what seemed like a short-- but ended up being 2 hrs of snorkeling trip around the ruins of the roman era fish farm and ponds. We were outfitted in wet suits and snorkel gear by the parco. A short powerpoint presentation made visiting the ruins under water that much more interesting. Everyone who works there is a passionate conservationist and amazing that this venture seems to be self funded by the reasonable entry fee of 20 Euro pp. Parco Gaiola is well worth a visit, especially after having seen the roman ruins in Pompei and Herculaneum. Call ahead for reservations (a must) and bring a picnic....there's NO food or drinks to be purchased on the beach and surroundings. It's a bit of a hike from the main road and not suitable for wheelchair or elderly people who are not reasonably fit. Having a car is convenient; easy parking at main road even in high season.
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