About 50km northeast of Cartagena, a few kilometers off the coast, there is an intriguing 15m mound that looks like a miniature volcano. However, instead of erupting with lava and ashes, it spews forth lukewarm mud, which has the consistency of cream. You can climb into the crater and frolic around in a refreshing mud bath; the mud contains minerals acclaimed for their therapeutic properties. Once you've finished, go and wash off in the lagoon, just 50m away.
The volcano is open from dawn to dusk and you pay a COP$10,000 fee to have a bath. Bring plenty of small bills to tip the various locals who will pamper you during your time here – massaging you rather inexpertly, rinsing you off, holding your camera and taking photos. All in all, it's a lot of fun and a rightly popular day trip from Cartagena.