The cheapest and easiest option to get to the caves. Benagil cave is a 5/10 minute swim around the corner from the beach, roughly a 200m swim. It may seem like nothing but don’t forget that the Algarve is a famous surfing region.
Its very important that you check the weather conditions, if the current is too strong or you are a weak swimmer then consider hiring a kayak or SUP where you’ll be given a life jacket.
The waves inside the cave can get very strong, when we visited the conditions were definitely not suitable for swimming to the caves, we hired a SUP and actually got thrown off if by the tide!
If the current isn’t very strong and you have a Lilo or another inflatable, hop on it and get kicking!
Wow. Gorgeous. Get some exercise, take stunning pictures, and enjoy this amazing view. Sounds like the perfect day.