I would like to express my deep gratitude to Elena for her quick and clear response. We took an individual excursion to Efest. Everything went great. I really liked the guide Natalia. I just honestly and heartily recommend this agency!
We ordered a boat trip along the third route. It turned out to be much cheaper than at the tour operator, and at the office on the beach ($ 28 vs € 40).
By the walk itself:
Black Island — you don't even have to go in (thermal springs — sea water, warmer than usual, mud - it's not clear from where, it's in a box there), in general, it's not worth paying extra even 3€.
The rest of the places are great swimming spots. Each with its own atmosphere. I liked the Turkish Maldives the most.
By ship: there is not much Russian, mostly Turks. The music was not annoying (we complained about it in the previous comment). The terms say that you can't take your drinks with you. You need to buy from them at three prices (water and soda for $ 3, beer for $ 6). In fact, you can take it with you, no one says anything about it.
The organization is excellent: transfers do not have to wait long. Everything is clear.
We ordered an hour-long horseback riding on the beach at sunset from this company. The availability of equipment and a professional instructor was announced. In fact: the transfer, which was half an hour late, brought to the yacht parking lot, where 6 pieces of poor devils stood under a canopy. Instead of reins, there are ropes, saddled somehow, no instruction and equipment. They pointed at the horse, said - sit down and don't be afraid! That's all the instructors said. Then the horses themselves lined up in a row and dragged along a rocky path along the sea at a decent height. Theoretically, it would not have been possible to avoid injuries by flying off a horse. For ten minutes the horses walked on slippery rocks, occasionally stumbling, then we were taken to a relatively flat piece of beach and led the horses into the water, we accordingly also found ourselves ankle-deep in the water. For another 10 minutes we were photographed from different angles by 2 escorts, well, the return trip took 10 minutes. Two points just for the fact that everyone was alive and well and beautiful photos (for which the accompanying girl was thanked separately) at sunset. If you're riding like we are, well, you can take a chance. If not, I strongly do not recommend it!