Reindeer - having investigated every possibility of petdom imaginable, then, yes, I can recommend a tortoise.
If housed correctly they are a doddle. Don't buy from a petshop (big trade of farmed torties imported from Eastern Europe) and don't house in a vivarium. Get one from the RSPCA or a breeder and bung it in a "tortoise table" (yes, that's what it's called. Sounds like something CITES should be confiscating, but there you go).
Speaking of CITES - you need a certificate. That's why a breeder's a good idea.
They are prone to respiratory diseases if kept in too humid an atmosphere. You know, like a glass tank. Petshops want to sell you the viv for profit, not for the tortoise.
Ours is in an indoor guineapig hutch. He has a UVB and a basking lamp (they need that for warmth and to help absorb calcium) so it works well as the burning hot lights are safely under the wire away from small fingers.
They are happiest outside in the sun - but, get a good enclosure. Those buggers are not slow, and can dig themselves into the ground in a flash. We've lost ours a couple of times (now solved by DD taking him for "a walk" on "a lead" made out of ribbon tied round him like he is a Christmas parcel. Odd, but works. Tortoise seems unfussed.
If you house them inside with a lamp then they don't need to hibernate. Things have moved on since Blue Peter - who killed thousands of tortoises with their crap advice - they need to be at least 4 years old to hibernate, and it's only really worth it if you want to breed it.
The other problem is feeding the wrong stuff. No pellets, no dog food, no crap, just weeds. We have a reputation for "weeding the neighbourhood" - any dandelion on the school run gets plucked.
Having said that, he is partial to a bit of pak choi and pea shoots.
And, he gets a bath every other day, ours is a bit of a reluctant drinker - and the one and only time I dealt with tortoise constipation motivates me to keep him well hydrated .
He's really interesting, totally cool - and, a CELEBRITY TORTOISE!
We adopted him from the SSPCA after he was found abandoned on a railway line in a storm. I'd been looking into getting one for ages for DD - saw it on twitter, called the SSPCA, now the happy owners of a tortoise.
Who'll live for another 70 years or so. DD's problem.