I would first see what's available. I know flights around Easter are pretty busy.
We've done Cebu (Shangri-La), Guillin (Sheraton), Taipei (Sherwood), going to Bangkok end of May (couldn't get 5 affordable flights around Easter). Other ideas, KL, Singapore, Kota, Sanya ... like most have mentioned. Otherwise, Shanghai, Beijing, Xian in China? Japan ... probably quite pricey, or South Korea (loved it).