begeistert
enthusiastic
Feeling and showing great joy, enthusiasm, or admiration for someone or something.
Die Kinder waren vom Ausflug in den Zoo total begeistert.
The children were totally enthusiastic about the trip to the zoo.

enthusiastic / thrilled
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enthusiastic
Feeling and showing great joy, enthusiasm, or admiration for someone or something.
Die Kinder waren vom Ausflug in den Zoo total begeistert.
The children were totally enthusiastic about the trip to the zoo.

'Begeistert' (enthusiastic) is the past participle of the verb 'begeistern' (to inspire/excite) and is used as an adjective. The word contains 'Geist' (spirit/mind): to enthuse someone literally means to fill their spirit with joy or enthusiasm.
Die inspirierende Rede hat das Publikum begeistert.
The inspiring speech enthused the audience.
To express what you are enthusiastic about, you use the prepositions 'von' with the dative or 'über' with the accusative. 'Von' often describes general admiration, while 'über' usually refers to a specific event or piece of news.
Ich bin begeistert von deiner neuen Frisur.
I am enthusiastic about your new hairstyle.
The feeling of enthusiasm is often strengthened with adverbs. Common combinations are 'total begeistert' (totally enthusiastic), 'völlig begeistert' (completely enthusiastic), or 'hellauf begeistert' (absolutely thrilled).
Nach dem Konzert waren die Fans hellauf begeistert.
After the concert, the fans were absolutely thrilled.
there / toward
'hin sein von' (to be crazy about) and 'begeistert' both express strong joy or admiration. 'begeistert' is more neutral and can be used in many situations, for example with music, food, work, or an idea. 'hin sein von' is colloquial and sounds stronger, often almost like someone is raving about something. It is used more in personal conversations. In practical terms: 'begeistert' fits almost always; 'hin sein von' fits when someone thinks something or someone is really great.

Die Gäste waren vom Essen im Restaurant begeistert.
The guests were thrilled with the food at the restaurant.
Meine Schwester ist ganz hin von dem neuen Sänger.
My sister is completely crazy about the new singer.