What types of late summer fruit can I preserve in booze?

Figs in port + brandy + a few anise seeds. And peaches in brandy + Slivovitz. (Slivovitz is just about every fruit's best friend when making preserves.) Incidentally, I got the very last cherries on the last day that they were available, for precisely this purpose -- putting into jars with brandy. I like to add a few dark raisins for the subtle flavor they add, as well as a vanilla bean, which I then re-use, once the fruit has been eaten, to scent vanilla sugar. (It's amazing.) For any fruit I put up in booze, I save the syrup until spring and summer, to use in spritzers or slightly boozey Friday afternoon slushies, made with frozen homemade almond milk (sort of a first cousin to Amanda's almond ice with cherries). I also paint the syrup generously on cream scones, a few minutes before they're done cooking. Mmmmm. ;o)

Peaches in brandy are sensational.

Any stone fruit halved with vodka! Plums are my favorite.
A really crisp apple in brandy.

Cherries, I always brandy some cherries to put in French 75s later in the year. They are good on ice cream too.

Nice, but pricey.

Prunes in armagnac are the best!

I've always liked rum and berries liqueur (blueberry, raspberry, blackberry). I just through them into a bottle with some rum and sugar, then leave in a cabinet. You can even do this with frozen berries. It's a recipe that's in Preserved by Nick Sandler & Johnny Acton.