Helping out my sister for her wedding preparations. Any suggestions for perfect wedding reception areas in Marikina (good for min of 200 pax capacity)?

For that number of pax, I'd suggest these two venue options that are known in the wedding industry in the Metro: Sedretos Royale http://www.sedretosroyalevenue.com/ and Water Nymph Resort http://www.waternymphresort.com/. Both resort event venues are very intimate, elegant and exclusive for private event like that of your sister's.