Published date: September 8, 2025
The Ultimate Pool Resort for Adults
Room Type Stayed
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Experience of the stay
I had my eye on Oiso Prince for a while, and finally managed to visit on Friday, Saturday, and Sunday!
This time, I made sure to book a room facing the sea. Maybe because I reserved three months in advance, I got a really good room near the elevator on the 9th floor.
* The top floor is the premium floor.
As soon as I entered the room, I was greeted with a spectacular view of Oiso Long Beach and the sea! It truly made me feel like I was on a resort getaway.
The room, while old, was very spacious! There was enough room to open my suitcase, plus a closet space and a sofa to relax. The toilet and bath are separate, and there was a large sink area. The bath felt old, but since there is a large communal bath, I didn't have to use the room's bath, which was fine.
On the first day, I managed to check in a bit early, so I changed and headed straight to Oiso Long Beach!
The best part about staying at Prince is that resident guests get half-price tickets.
I bought afternoon tickets on the first day from 14:00 to 17:00 for half the price, which was 1,400 yen instead of 2,800 yen.
On the second day, I went to Oiso Long Beach in the morning.
After enjoying the Oiso pool on the second day, I went to the Prince's spa & infinity pool.
Although the hafuh plan does not include tickets, for 2,000 yen, you can use it from that day until 11:00 the next day. The view from the infinity pool was fantastic, and I enjoyed a leisurely time watching the sunset.
Then, I felt refreshed after using the large communal bath! * The large bath is free for guests.
Meals inside the hotel can be pricey, so I decided to eat out both days. There were Chinese and Italian places about a 10-minute walk away, so I didn't struggle to find food.
After returning, I went back to the infinity pool, which is open until midnight.
And on the final day, since it was the last one, I thought I might as well pay a little over 3,000 yen to include breakfast.
However, this was the only disappointment of the trip. Honestly, it was rather mediocre, so I felt it wasn't necessary to include it.
On the last day, I decided to enjoy the spa and infinity pool after checking out.
If I had purchased tickets the day before, I could have used it for an additional 1,000 yen until 18:00 after check-out.
The night before was busy, but during the day, it was relatively empty as everyone seemed to be at Oiso Long Beach. I had a wonderful time swimming in the pool, napping on the sofa, and relaxing in the sauna.
* During summer vacation, children can enter, but it is normally an adult-only spa.
After having a great time, I returned by bus to Oiso Station.
It was a short journey back home, which is another charm!
I thoroughly enjoyed the adult pool experience over two nights and three days, feeling a break from everyday life.
I reserved three months in advance, and I still found it to be about 15,000 to 20,000 yen cheaper compared to other booking sites.
I definitely want to visit again one day; it’s that nice of a hotel!
Experiences during the trip
The main purpose of this trip was Oiso Long Beach!
Often, large pool facilities are crowded with young people, which can be intimidating, but here, there are many guests in their 40s and 50s, creating a calm atmosphere. Guests in their 40s and 50s can be seen relaxing on benches, floating in the pool, and even enjoying the slides, which adds to the pleasant vibe.
The lazy river is also quite impressive, taking over 20 minutes for a complete loop, providing endless fun just floating along.
I also recommend the dive pool with heights of 3m and 5m, where they host 10m dives several times a day. During the 10m dives, there is a large audience, and every jump gets a round of applause! It's enjoyable just to watch.
I would love to visit again.