Okay, well I'm a huge Maceo Plex fan. So for me, this is the party to go to! Do you like Maceo Plex?? Quite a departure from David Guetta & Co.
Mambo is quite a tourist trap. Nice to tick-off your list if you haven't done it, but ultimately, you're not really missing out on much. Are you only on the island for 24hrs?? Could you not go another night?
Taxi to Destino from Bossa will be about €15 if memory serves me right (could be wrong, perhaps someone can advise?) There is also a bus I think I've read though not used it.
It's conceivable to walk from Destino to Pacha/Ibiza Town after Mosaic. But otherwise, taxi back (taxi queue can get quite horrendous depending on when you leave)
If you opt for Mambo then either taxi to San An from Bossa (€25-30 depending on traffic). Or you could get the bus via Ibiza Town. The bus service is pretty good. But leave yourself plenty of time. Otherwise taxi from San An to Pacha/Ibiza €20-€25