The water park itself does not have a hotel, they contract with the surrounding hotels, so you would have to book through their site to get actual pricing. The dates that you choose and the actual hotel that you choose will determine price- certain hotels are more expensive than others.
As others suggested please visit the website. Basically, you have 5 hotels on their website out of which 3 are connected internally to the waterpark. As an example, from December 24th to 25th one night includes, Up to 4 Splash Lagoon Passes - The passes are good from Noon on your date of arrival, until the park closes on your departure date - Complimentary Continental Breakfast. Check in is 3pm though. That was a 2 queen bed @ the Comfort Inn and suites for almost 262 USD at the time. (tax in). This is one of the three attached. I don't know if one room could take 6 people, kindly check their limitations per room. Hope this helps.
Depends on the hotel, also I reccomend booking with the hotel directly so you save more money that way, but on r The splash lagoon website, it depends on the date, and amount of people. If you give me the dates the amount of kids & adults I can get you info.
You can set reservations on splashlagoon.com
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