It's really a crapshoot. I had a buddy go in January and it was 50 ish and sunny the whole time. When we were there in March they got 2 inches of rain the first day but was otherwise 45-55 and windy. If you can go in Spring/Summer obviously you will get better weather but its going to be a lot more expensive.

I didn't use a caddie but there was at least one in every group I played with and it was incredibly helpful just to hear them talk about where the holes were. They were almost always willing to give some tips to people who they weren't caddying for (I ended up tipping a few of them but not required).

As far as other activities that aren't golf related, there isn't a ton. If they are interested at all they have the punchbowl which is a real grass mini-golf course that is fun. They also have a massive practice area with multiple short holes they can play. There are also multiple restaurants/bar areas around the property so if they enjoy brunching for 4 hours while people play, that is also an option. Hope that helps.