5. When I am inside the dojo I have no trouble closing my eyes while meditate, but when I am in the beach or in the forest, I am distracted and I can't keep them closed. What can I do?

...They are not distractions, instead they are "direct calls" to open yourself and be receptive in the reality of nature. It is your time to practice letting go. Without forcing anything just breathe, relax and smile...
... There are many lessons we can take from nature. It is not coincidence that those who are interested in Zen or meditation find themselves drawn to natural surroundings and seek peace and quiet in the wilderness. It is not only because they wish to eliminate distractions. For some, it is because they find that when they are immersed in nature, there is almost no need to meditate! It might be better said that the contemplation of nature and the breathing of fresh air allows the meditation to become more full, alive, and aware. In a city, or a situation that has tension, anxiety, or danger, the need to meditate formally (in the conventional sense of closed eyes and quite sitting) is more immediate and essential as a balance to external forces. Imagining a calm place in nature helps the practitioner return to relaxed clarity more readily.