do it, but pick a good place
i did and i grew and matured exponentially. it's a personal experience and you'll meet great people from all over the world. i volunteered at peak times in asia for 10 weeks, lived there for 3 months, and it was life changing.
any of these punks on here ever haul tons (literally) of rice from the patties to a warehouse in 50 celsius? or get drugged at 3am and robbed of all your money? climb huge trees to pick fruit for hungry orphans? or rent a motorbike and explore the countryside (in bum****ing egypt) for a week, far from any tourist or big city, seeing billions of stars above you at night? then crash and get injured so badly you can't walk for two weeks and 4 hospitals deny you care since you're not a citizen? chances are, no. chances are, most volunteering in USA will be you in a fluorescent-lit room with filtered HVAC system folding sheets trying to curry favor with nurses, who, while they appreciate your help, don't need you desperately.
many places where i worked needed me badly. e.g. there was ONE person to do acres of farmland, out of 20-30 international volunteers, no one wanted to farm land (it's exhausting), so i helped her out. i also helped plan and implement systems i found in use in european hostels to reduce their use of food/water/soap/etc.
i expect if you find a good place in a 3rd world country you'll be needed, too.
worked for a startup NGO and became friends with the president's friend's son. he had a mercedes, audi, 2-3 porches, a bmw, and 4 chaffeurs and took me everywhere. 😀
plus, many start up NGOs need talent and people who speak english. they'll value your time.
i don't know whether you'll have a great time, but i did. it was really fun.
rambling again, but to everyone who says "meh, not impressive." the point is to not impress adcoms. to impress them, intern or do research with a university with a big fancy name like stanford.
but to grow personally and embark on a journey, open your eyes and see the world.
so many people here are into rankings ("oh hai i go to a top 25!" i don't care? 25, 35, 50, does it make a big difference?) and other prestige crap ("im part of an honor society!!" that's cool, but... so?) to impress adcoms, and i have no problem with that. but life is more than a number on a ranked list. life is more than posturing. it's about DOING what you are passionate about. have fun, go volunteer somewhere if you have the time and money. it might not look super great on the resume, but it's a personal journey no one else will quite understand unless they go through it themselves.