As a member of the LGBT community myself, I have been surprised and delighted at how accepting Nicaragua and San Juan Del Sur has been. I have never had a problem.
As you get to know Nicaraguans and as the depth of your relationship grows, we get to know private information about one another and start sharing private information as well. I have found that the sharing of that information is considered perfectly acceptable, shareable, and even celebrated. It has been absolutely amazing.
My own experience here in Nicaragua as a member of the LGBT has been very welcoming. There is actually no need for specific gay venues or gay restaurants. I walk around town and tell people I have a boyfriend, and the next thing they tell me is to bring my boyfriend along. It is always taken with a pinch of salt.
Very often, Nicaraguans will first check that I have said “novio” (the male form of "boyfriend / girlfriend) and that I mean “novio”, as opposed to “novia” (the female form). And then as soon as I confirm that I said, “Novio, I have a boyfriend,” it is like I told them that I had cornflakes for breakfast. There is not a negative reaction at all. To the contrary, it has been something that has been celebrated.
So I can say that my experience has been one of welcoming and I have never had any bad experience being a member of the LGBT community in the 7 years that I have lived here in Nicaragua.
Diversity is something that is celebrated and taken for granted. It fits overwhelmingly with a Nicaraguan phrase, “Cada cabeza es uno mundo”, which translates to “Each head is a world”. This is a phrase that Nicaraguans use to build respect for differences or accept differences of choice, life, opinions and other kinds of differences. They sort of shrug their shoulders if you do not agree with them because "every head is a world" and so "every world is unto itself."
That is a long answer to a very important question. It was unexpected and it was very delightful for me to experience.