1. LAUREN BUSH LAUREN
CEO of FEED Projects
"The UNESCO World Heritage site of Angkor Wat in Siem Reap, Cambodia."
Budget: Try the Golden Temple Villa. (From $15; goldentemplevilla.com) Cushy: Splurge on the Raffles Grand Hotel d'Angkor. (From $296; raffles.com) Feel-Good:Build houses with Habitat for Humanity. ($1,750 for a 10-day trip; habitat.org/gv)
2. SARA BAREILLES
"Old churches and amazing, affordable meals in Bologna, Italy."
Budget: Book a room on Airbnb.com. (From $35) Cushy:Stay at the Grand Hotel Majestic "gi Baglioni." (From $250;grandhotelmajestic.duetorrihotels.com) Feel-Good:Help a small-scale farmer through WWOOF Italia. ($34 for a year's membership; wwoof.it)
3. NATASHA LYONNE
"Volcanic hot springs and incredible skiing in Las Trancas, Chile."
Budget: Stay down the mountain at Cabañas Los Andes. (From $100; cabanaslosandes.com) Cushy:Ski-in/ski-out at the Gran Hotel. (From $191; termaschillan.cl) Feel-Good:Teach English in Santiago and hit the slopes at nearby Portillo. ($2,575 for two weeks; unitedplanet.org)
4. LIYA KEBEDE
Founder of Lemlem
"Namibia, for the sand dunes, which change color with the sun."
Budget: Go for the Cardboard Box hostel in Windhoek. (From $33; cardboardbox.com.na) Cushy: Spring for the Wolwedans Dune Lodge in the Namib Desert. (From $300; wolwedans.com) Feel-Good: Help farmers and elephants cohabitate in Damaraland. ($1,295 for two weeks; desertelephant.org)