Menorca's beaches are an incredible sight to behold, but it's a shame that mass tourism is having an adverse effect on the environment. You can often spot oil and plastic floating around in the waters, and while there are regulations in place, they are rarely enforced. This means that you may find people playing loud music on the beach or boats travelling in areas that are off limits. Additionally, there are not many bins along the trails and a lot of people don't bother to take their rubbish back with them. Be aware of jellyfish too; I saw two while swimming today, even though there were no warning flags. Make sure to bring swimming goggles with you to help you spot them and reduce the risk of being stung and having your day ruined.