any ideas with sea side seasonal hostel ?

I used to run a seaside hostel, and we got about seven months for each season. We usually opened shortly before Easter (late March or early April). We were lucky to have long summers with lots of sunshine, so we shut our doors at the end of October. July, August, and September were our big months, with everything else serving as an extended shoulder season. April and May were usually quite weak, but it gave us a chance to give lots of personal attention to the few guests that we had and build up some positive reviews before the tourist season started. It also gave us a chance to find and train new staff, since the majority of our crew found other jobs each winter.

Are you planning to rent different buildings for six months at a time and change locations each summer? Considering the work that would probably be needed to prepare the property for each season, would it be more cost-effective to use the same place each year? Maybe you could sublet it to someone else in the off season?

of course its better to use the same place.
i don't mind to be closed at low season and just to pay the rent.
the matter is that renting a house is very expensive. the only solution is renting big apartment , which i already have , unfortunately its a risk to get complains from the neighbours and to be forced to change the address . i have already experience , so i know . if you have big groups in your apartment , neighbours might make you a problems.
therefore , its not a big problem if i change the addresses from time to time.even if
i build the toilets and showers for my own money , but i know that sooner or later there will be need to change the address.