Finding what you like is important! I like having options too. I particularly like activities that are a combination of exercise and social/outdoors activities. Skiing, hiking, rock climbing, swimming, running, yoga, dancing, kayaking, etc. Gaining active pastimes I think are the biggest help in maintaining good physical conditioning (if challenging in winter

).
Getting started I think is usually overthought. Just start doing something that sounds fun. You don't have to plan the next six months of exercise and so on. (Heck, I'm not even a huge fan of gyms, and only belong to one because it's harder to get ahold of swimming pools than a place to run.) Just getting out and getting started is important. (Details like sit-ups or push-ups is a hair-splitting, as they're both a variety of weight training, and both should be done - in addition to other weight training exercises - together.)