Most travellers, upon reaching Semporna, turn into little kids on a long car trip: 'But how much longer till we get there?' with 'there' being Sipadan. Semporna-the-town is the mainland stopping point before Semporna-the-archipelago and all your diving/snorkelling fantasies. Unless you're lucky enough to get here early in the morning, there's a good chance you'll be sticking around overnight. Semporna's fine for an evening of carousing at a bar before donning your fins or checking out the pasar ikan (fish markets) and water villages; past that, enjoy your sleep. Not much longer, kids.