When I was single I had a tarantula. He died when dss was about 3 or 4 and I haven't had the opportunity to have another one, but if I had to choose, that's what I would get. Mine was really wonderful to interact with and would sit on my shoulder while I walked around the house doing chores or reading or just about any time I was home. Maintenance is a piece of sponge with some water in it (no water dish as they can drown). Feeding was once a week throwing in a few crickets.
OK, so maybe not a tarantula, then you could get an iguana. Higher maintenance, but definitely something you interact with. Of course, you have to interact early and regularly to train them and space would become an issue as it grew. Diet is difficult because you have to have a specific proportion of vitamins or they get sick. Dark greens are best, kale, collards, spinach, etc. Throw in some melon occasionally, mine liked that. But as I said, maintenance is a bit more intense. UV light is a must, but must be regulated, they can die if it is left on all the time. Warming rock with a towel over it otherwise they can get burns from it. Mine loved going swimming in the bathtub about 2 times a week.
Maybe a smaller reptile, but I've never owned any so I'm not sure how high maintenance they are.