Oslo, Oct 20-26 suggestions please

Among top sites to visit are Frogner Park with it’s wonderful display of sculptures.
The Brygge, waterfront. We had a wonderful shrimp lunch, peel and eat, at Lofoten Fiskerestaurant.
Take ferry out to visit several small museums on the Bygdoy Peninsula: - Norwegian Folklore Museum, The Fran Museum and Kon Tiki, all walkable from one to the other and we’ll worth a visit.. Sadly the Viking Ship Museum is closed at this time.
You could go on the Norway in a Nutshell excursion. We found the Oslo Tourist office to be very helpful.

My top of the list from Rick Steve's list:

▲▲▲ City Hall Oslo's artsy 20th-century government building, lined with huge, vibrant, municipal-themed murals, best visited with included tour.

▲▲▲ National Gallery Norway's cultural and natural essence, captured on canvas.

▲▲▲ Frogner Park Sprawling park with works by Norway's greatest sculptor, Gustav Vigeland, and the studio where he created them (now a museum).

▲▲▲ Fram Museum Captivating exhibit on two Arctic exploration ships.

▲▲ Norwegian Folk Museum Norway condensed into 150 historic buildings in a large open-air museum. (3 stars for me)

▲▲ Norwegian Resistance Museum Gripping look at Norway's tumultuous WWII experience. (Three stars on my list)

▲▲ Viking Ship Museum Impressive trio of ninth-century Viking ships, with exhibits on the people who built them.

▲ Oslo Opera House Stunning performance center that's helping revitalize the harborfront. (The roof is 2 stars on my list)

▲ Akershus Fortress Complex and Tours Historic military base and fortified old center, with guided tours, a ho-hum castle interior, and the excellent Norwegian Resistance Museum (listed above). (Nice walk about)

▲ Norwegian Maritime Museum Briny voyage through Norway's rich seafaring heritage.

▲ Edvard Munch Museum Works of Norway's famous Expressionistic painter. (Scream)

▲ Aker Brygge and Tjuvholmen Oslo's harborfront promenade, and nearby trendy neighborhood with Astrup Fearnley Museum, upscale galleries, shops, and cafés. (Fun place to hang out and dine.)

▲ Holmenkollen Ski Jump and Ski Museum Dizzying vista and a schuss through skiing history, with a zip line off the top. (As a skier, 3 starts. Great panaramic view of Oslo from the top of the ski jump tower and a scenic metro ride up the hill.)

Consider the Oslo Pass (24, 48 r 72 hour):

https://www.visitoslo.com/en/activities-and-attractions/oslo-pass/whats-included/free-with-the-oslo-pass/

Oslo Pass attractions include:
https://www.visitoslo.com/en/activities-and-attractions/oslo-pass/whats-included/free-with-the-oslo-pass/

To get an idea of what you'd like to see in Oslo, it's a great idea to read a good guide book, like Rick's, which will discuss the various sites and put them in context — you read it with an eye toward what interests you and then are able to make some educated decisions.

As the poster above noted, Rick gives one two or three triangles to sites based on his assessment of what is intrinsically most interesting, and he has a lot of experience and insight — but you of course need to take your own preferences and interests into consideration.

Some things have changed in Oslo since RS compiled that list:

• The Viking Ship Museum is closed until 2025 or 2026. The Historisk Museum has some Viking objects; I don't remember whether any of them are ship-related.

• The National Gallery has closed. The collection of art and decorative art is now part of the new National Museum, which is excellent.

• The old Munch Museum has closed, replaced by the new MUNCH, which is on the waterfront near the Opera House. A must-visit if you like Munch.

You have gotten some very good suggestions. But what kind bike or vespa tour are you looking for, and why? It would not be my choice and you'll struggle to find a company that offers that. But you can of course rent bikes and discover the city on your own if you really want to.

I would like to cover more ground. We love vespas.

Any restaurant suggestions?

Resturants. Starting point would be a hardy breakfast buffet at your hotel. Thon hotel chain usually has a good spread.
https://www.thonhotels.com/inspiration/food-and-drink/how-to-make-a-hotel-breakfast-at-home/

The secret behind a proper hotel breakfast What else is typical of a
hotel breakfast?

Variety matters! A full buffet of delicious food, a combination of
warm and cold dishes, and wonderful drinks in different forms and
colours. Not to mention a selection of sweet pastries and cakes! One
of the best things about a hotel breakfast is treating yourself to a
dessert after your savoury breakfast.

If you are looking for economy dining try Peppes Pizza with multiple locations in Oslo. Multiple loactions. Another economy option is a Doner Kebab shop again with multiple versions tucked away in Oslo hole in he walls.

For more upscale dinning walk about the Aker Brygge and check out the waterfront dinning options. https://theculturetrip.com/europe/norway/articles/the-10-best-restaurants-in-aker-brygge-oslo/

If you are a Jo Nesbo Detective Harrry Hole novels fan, try RESTAURANT SCHRØDER.

Classic pub and restaurant at St. Hanshaugen with traditional
Norwegian food on the menu and a relaxed atmosphere that attracts a
good mix of regulars, locals and visitors.

Schrøder can trace its history back to 1925 in Oslo, and back to 1956
at St. Hanshaugen. The restaurant is also known as the favourite
hangout for detective Harry Hole in Jo Nesbø's popular crime novels.

For traditional Norwegian:
Grand Café Oslo Karl Johans gate 31, 0159 Oslo, Norway
Engebret Cafe Bankplassen 1, 0151 Oslo, Norway

And one of the better evening dinning experience in Norway afer a week long hut to hut ski tour in the Jotenhimen mountains:
Dinner Resturant Stortingsgata 22, 0161 Oslo, Norway

I would like to cover more ground. We love vespas.

To cover more ground, Oslo has an excellent network of buses, trams and metro. Also, do you love vespas when it's 5°C and raining?