Yes, there are heaps of restaurants close by. Many of them are in the nearby Aqua City mall but just outside the hotel near the Lawson convenience store is an Italian called Incontro, and the Bakery, which does the most amazing sit-down lunches and takeaways. You can even have a glass of wine with your lunch. Prices are extremely reasonable.

I had it included in the room. It was more cost effective.

I would consider hiring a local guide to show you around. There are infinite attractions in Tokyo. Another idea is to take a river cruise from the marine park pier which is close to the hotel, to Asakusa or Tokyo Skytree. A train to the centre of Tokyo can take from 30minutes to an hour depending on where you want to go. There’s a train station across the road from the hotel. Book a bay view room with a view of Rainbow bridge and the entire Tokyo skyline. It’s fabulous.

For Nikko: Take a taxi to Tokyo Station and take Shinkansen to Utsonomiya and JR service from there to Nikko. There are 2 Ibarakis in Japan and you have not stated which one. Best to go to Google maps and sort it yourself.