The sun is very strong in summer and especially in August from 11.00 to 16.00. You should often use a high factor sun block, always wear a hat and sunglasses.
You should be very careful when you drive a car or a motorbike because the roads usually are not well maintained and they are often narrow and winding.
Although not an overcrowded destination, mind that it is important to book your return ferry ticket from Kythira to Neapolis on time since you cannot book your return tickets in advance. Besides the routes are not very frequent and there is a small possibility of not finding easily a return ticket.
In case you find a caique that offers a boat trip to Hytra Islet, just not let this opportunity pass by usually there are organized trips with a guide so mind to take the afternoon ride and live the experience of exploring a wild paradise.
Hytra does not have beaches or any kind of infrastructure but the seaside cave is definitely something you should visit with your mask.