May half-term is around the corner and, as one of the busiest times of year for family days out, it can quickly become one of the most expensive, too. From theme parks and zoos to aquariums and historic landmarks , costs can quickly add up when you factor in other expenses, such as travel and food (there are plenty of places where kids can eat for free during school holidays ). The good news is you don’t have to pay full price. With the right deals and smart booking, it’s possible to save up to 50 per cent on entry to some of the UK’s most popular attractions, including Alton Towers and Legoland Windsor Resort. I’ve rounded up the best cheap May half-term days out, plus practical ways to cut costs on travel. Enjoy early access to rides at Alton Towers when you book an overnight stay (Alton Towers/Merlin Entertainments) If you’ve got thrill-seekers to entertain this half-term, theme parks are guaranteed to please.…