My yeshiva took us to eilat. We rented a boat and had all the water activities (scuba diving parasailing etc.) brought out to us (and pizza for lunch).
Regarding bochurim going wild in my yeshiva we have guys who for the most part have been with girls (take it as you will), have experimented with drugs alcohol. When they come to Israel it’s their chance to make a fresh start away from everybody. In the beginning they go a bit wild, they go to town a lot get drunk but then by chanuka they realize that its all a waste of time. If they don’t, they usually don’t make it back after pesach.
The real problem is with the good bochurim who get messed over. I personally know a shtark bochur from a choshuve yeshiva in america who told me that he hadn’t learned in months. The entire time he had been hanging around in dance clubs, bars with girls watching movies all night getting drunk doing drugs. He left Israel to BMG because it was time to get married. Another bochur I know personally came from a shtark yeshiva and left no longer frum. I know many similar cases. I realize that this isn’t the majority; most bochurim shtaig in Israel, but some can be really harmed. As previous posters have mentioned everything is much more accessible than in america (and it isn’t the zonas who are the problem it is the huge amount of girls from weak backgrounds in yerushalayim for seminary)
I feel that Israel can do wonders for growth but if a yeshivish guy is starting to “look around the world” Israel is not the place to send him.