Try this maps
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On a day trip these sights are grouped together -
From Xian city
First stop - Banpo Museum then Huaqing Hotspring then Terracotta Warriors then Tomb of Qinshuang (the first Emperor responsible for the T Warriors. Before you get to Banpo or on the way back you could go to Qinglong Temple as it is kind of the same SE direction. For that matter so is Xingjiao Temple.
Now in a westerly direction from Xian city the route roughly follows this one - Maoling Tomb, Tomb of Yangguifei, Qianling Museum, Famens Pagoda - you could do a loop of these visiting Maoling Tomb, then Tomb of Yangguifei then Famens and then on the way back into Xian Qianling Museum.
There are so many places to go and so many artefacts that it will be hard to absorb it all. There are many artefatcs on display at the Teracotta Warriors museum itself, that may be enough for you unles you are a complete history buff. You can see the Tomb of Qinshihuang at a distance when you go to the Warriors so if you need to see it up really close then you can go there, otherwise that will be there will be a view from the road of the mound in the distance.
That's all I can do to fill in the blanks here. If I were you I would choose ONE mausoleum.
The mausoleum of Princess Yongtai is related to Qianling's mausoleum (18 tombs in all) and it looks like Emperor Tang Gaozang & Empress WuZeian tombs are around here too.
Now for the evening entertainment - how many nights did you have
The Tang Dynasty dance show is available at the Tang Paradise Them Park, Xian Garden Hotel (smaller venue) and at the better known Tang Dynasty Restaurant venue near the Small Wild Goose.
Pagoda. It really is worth seeing - it is a very professional tourist oriented show. After the show I would get into a taxi and drive around the wall and the Drum/Bell Tower to see the place lit up at night and take a few photos. That way you kill two things at once.
The Big Wild Goose Pagoda square at night - was my highlight.and It is free. The atmosphere with the locals is superb. The musical fountain is really something to behold - it is a huge spectacle. There are restaurants around the square too. Fantastic.
The Tang Paradise is a new theme park. It is very different to any other park I have been too. There are gardns that you wlak through of various kinds and there are replicas of the Tang Dynasty palaces. There is also a theatre here and the 3D water film extravaganza - but they are at the same time and you can't do them both. There are restaurants here. You can of course go here during the daytime but the 3D water film show only happens at night.The Tang Paradise theme park is closeby the Xian Garden Hotel and is walking distance (about 10 mins) from the Big Wild Goose Pagado Square. Diiner at the Fench restruant in the Xian Garden Hotel is lovey if you are in the visinity and craving for something wester, They have a lovely cocktail/coffee loung in their foyer too if you want to relax and sit by their internal lake garden.