Maybe see a show, Cirque, Celine, magic or a musical. There is something to entertain everybody. Choose to dine at a Michelin star rated restaurant — there are quite a few in the city. A nice spa pedicure and a massage could be a great idea before heading into the wilderness. Even just a stroll down the Strip can be a fully entertaining evening activity! If you have a vehicle and are in for a more nature-oriented activity, check out nearby Red Rock Canyon National Conservation Area.
Whatever you do, enjoy it and then leave civilization behind for a few days!