Diamond Falls was probably the main attraction (as far as we were concerned) of the Diamond Botanical Gardens and Waterfall property. What made this waterfall stand out was that its waters were laced with minerals as its stream emanated from rainwater mixed with volcanism giving the falls a rather colorful appearance that seemed to change a lot. The falls itself was probably around 10-15m tall and the walkways were well mantained and signposted meandering amongst a very large collection of plants and trees that were important to the island either agriculturally or from a biodiversification standpoint.
We actually visited the Diamond Botanical Gardens as part of a boat tour on a particularly rainy day. So we walked around the garden complex as a group with a guide (who happened to be Peter Simon again - the guy that guided us to Enbas Saut Falls, Spyke Falls).
I'm sure we could've visited this place on our own a day earlier, but we chose not to considering we were planning to come back here as part of that boat tour.
Given the concentration of compounds (such as acids as well as minerals), there was no swimming allowed at Diamond Falls. However, there was said to be swimming allowed at the more diluted waters at Warm Mineral Falls (also called Piton Waterfalls) near the Jalousie Hilton Spa and Resort between the Petit and Gros Pitons. We didn't visit that other waterfall, however.
Getting to the botanical garden is a fairly straight-forward affair. As we weaved our way through the narrow Soufriere streets, we eventually got onto to the Sir Arthur Lewis Street. The turnoff to the garden was on the right a short distance before the bridge over the Soufriere River (around 2km east of Soufriere).
To give you some additional context, the drive from Gros Islet to Soufriere was about 54km (taking us about 90 minutes). It was another half-hour of driving very slowly towards the falls. Gros Islet was on the opposite side of the island from the airport some 65km away (or 90 minutes by vehicle). The flight from the Miami International Airport to the Saint Lucia Airport was on the order of 4 hours.
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