I've worked at 4 different hotels now.
They have never been referred to as groundskeepers though.
First - we had around 10 maintenance workers. They did everything from mowing the grass to setting up chairs in the conference center. It was a 3.5 star establishment would have been 4 if the rooms were accessible from the check in area. But the place was pretty nice. a mirco sized Westin but with a way better restaurant menu.
Second - We had 1 maintenance dude, he was old and did everything.
Third - We had a lot of very weird stuff going on. I'm not really sure who did what. There were around 300 rooms I believe which held 4 to 10 people, 5 hot tubs, outdoor heated pool and so on... the place was pretty ridiculous but there wasn't any one person that just worked outside.
Fourth - We had a houseman and a maintenance guy. Houseman did stuff like deal with all the trashes outside, changing lighbulbs in rooms, handling immediate requests, maintenance guy fixed stuff in rooms, handled the mowing and so forth.
Most likely if you are at a hotel, it will be a combination of many indoor and outdoor things. The more you have outdoors the more you will be doing. Like if you have an outdoor pool or an indoor pool. If you have conference facilities and so forth. Most likely if you have an actual garden, you will have a gardener.
The heat really isn't that bad and you will most likely have a decent amount of down time. And, if the hotel has a restaurant, they give you either free meals or super cheap really delicious ones.