if in time for sinulog, then have it categorize to parties, culture-awareness, foodtrip, adrenaline stop-over
parties -- everywhere is practically partying so maybe u can check the scene out by going to the fuente first coz there are noteworthy areas where you can have pics taken, then leading to mango, left and right ang party, then there's ayala way up to crossroads then your last stop will be IT park -- syaro, party til u drop jud
culture-awareness -- we have diff museums na, sto. niño museum near the church, the one near the cathedral, the museum sugbo (what used to be the jail along martires), casa gorordo, casa sandiego-yap in pari-an then you can drop by the magellan's cross
foodtripping -- u take your friends to places where they don't have it in their place like sutukil, sunburst (my manila friends and family would claim sunburst is incomparable to the chicken there), moooncafe, cafe elyse (in pari-an), streetfood tripping bah mo, lechon tripping pod mo since we've got the best lechon, dessert factory, casa verde, hukad... try the malls since they got most of the restos i've mentioned
adrenaline stop-over -- try the ziplining in busay, the skywalk or the edge coaster in crown regency then afterwards, u can hit the beach -- i dunno the cheaper ones coz what i'm most familiar are the resorts hehehe...
hope this helps