I love introducing new people to camping and the outdoors. I think it helps to start with something easy (campsite, quick hike with waterfalls, etc.), but try going early in the day or during the week when it's not going to be crowded with people. For camping, we always do s'mores and have a game that we can play in the tent if they're ready to call it early.  We also like to give them easy tasks that also make a noticeable difference (help setup the tent, grab some sticks for marshmallows, etc.).