The good information is that lovers of Jimmy Buffett will discover lots to love in “Escape to Margaritaville,” 2017 musical now strolling at the First Interstate Center for the Arts. There are lots of preferred songs with the aid of the troubadour of the Caribbean. “Margaritaville,” of course. And “Cheeseburger in Paradise.” There’s “Volcano,” “It’s Five O’Clock Somewhere” and “Why Don’t We Get Drunk.” That last one turned into an audience participation number as the crowd eagerly and loudly finished the road, “Why don’t we get under the influence of alcohol … AND SCREW!” There are interior jokes aimed at…