Which coast are you on, and when is the trip? Mainland Mexico is always good and cheap for summer swell. Beachbreaks, reefs, points, plenty options and airports to choose from. Costa Rica is easy and plenny waves but expensive and crowded nowadays. HI always has waves, but summer swell equals town crowds on the south shore and $$$$. PR and the entire east coast is kinda hurricane dependent for summer swell...Indo, Fiji, Tahiti are all guaranteed good times depending on time and money.
For quick and cheap can't beat mainland Mex. Fly into ZIH, rental cars were $8 a day last I was there. Drive time is 30-90 minutes depending on where u go. Beachfront accommodations from $10-100 depending on what u want (shared bath no ac =$10), I normally pay 20-30 a night anywhere in mex. Can also do PUerta Vallarta, Manzanillo, Mazatlan, Puerto Escondido, etc. all pretty similar rental cars roughly $20 a day, and cabanas for $20 a night.