A hand ringing a bell at a hotel check-in. Credit: Peter Dazeley/Getty Images Many modern hotels are going above and beyond when it comes to complimentary amenities—here's what you could ask for the next time you travel. Travelers often have to make tough choices about what to bring on a trip and what to leave at home. And if you're traveling light, airline carry-on bag policies make it even tougher. Thankfully, hotels have noticed and usually stock complimentary amenities that most guests would never think to request. "We often encounter guests who either forget or choose to leave behind certain amenities that just don't make the cut," said Joon Chang, a hotel manager who worked at Kimpton George Hotel in Washington, D.C., which offers a Forgot It? We Got It program.…