Where to find good cave-swimming?

Question

I'd love to travel to a place that has a good cave-swimming adventure.* I'd like it to be:

• Safe
• Warm
• Fun
• Suitable for an amateur
• Good for photography is a bonus
• I'd love it if it's a cave that's connected to the ocean.
• Anywhere in the world is fine, as long as it is generally accessible to a normal tourist (no intense mountaineering training needed, etc.)

What are my options?

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^{* My sister mentioned a friend took her to such a place in Hawaii, but even knowing that I have no idea how I'd find the specifics.}

Answer 1

"The Grotto" on the Bruce Peninsula (Georgian Bay, Ontario, Canada) could be a good choice. The water's always cold (though it can be plenty hot outside), but if you take appropriate precautions it should otherwise match your criteria. It's pretty cool:

You can actually swim through the hole in the bottom out into the bay. There are a lot of cool cliffs and trails in the area, it definitely makes for a good vacation. If you're interested in more caves and more complex caves, this might not be the place, although there are a few other bayside caves I've seen in the area and definitely more away from the water.

Answer 2

If you are after very safe and fun, if a bit touristy, there are several destinations around Cancun, Mexico (these are known as "cenote"). See http://yucatantoday.com/en/topics/cenotes-underwater-sinkholes.

Answer 3

fun caving at Sukabumi Indonesia Sukabumi - Indonesia
http://wisata.kompasiana.com/jalan-jalan/2010/10/19/fun-caving-di-sukabumi/
http://www.virtualtourist.com/travel/Asia/Indonesia/West_Java_Province/Sukabumi-1206389/Things_To_Do-Sukabumi-TG-C-1.html

Answer 4

The Blue Grotto on the island of Capri, Italy, seems to fit all your criteria:

However, it is very famous, popular and therefore overrun with tourists:

Capri is very beautiful and well worth visiting. There is also a Green Grotto on the other side of the island, which is less overrun (possibly because it's not really a fully enclosed cave).