On a budget, Cable Car to Mount Srđ still earns its price.
~€27 return
The view from the top is the one everyone's seen and it does not disappoint — the whole Old Town laid out like a model with Lokrum floating offshore. The catch is the line and price, and the summit can be windy or hazy; sunset is spectacular but mobbed. The walk down (or up) is free and doable if you're fit.