not required (adjective) optional: possible; available as choice
Sinonime: biking, commutation, cruising,
drive,
driving,
excursion,
expedition,
flying, globe-trotting, hop, junket,
movement, navigation, overnight,
passage,
peregrination,
ramble,
ride, riding, sailing, seafaring, sightseeing,
swing,
tour, touring, transit,
trek, trekking,
trip,
voyage, voyaging, walk,
wandering, wanderlust, wayfaring, weekend
Antonime: compulsory,
forced,
required