Alternative to City Sightseeing Red Bus Tour

Hello all,

Going to Iceland on Tuesday 3rd March, and had intended on doing the City Sightseeing Red Bus Tour - it's a silly tradition for my family and we have a couple of people with mobility issues, so it's a really easy way to see cities without too much walking.

We've just seen on their website they have operational issues and won't be running from 2nd March to 23rd May.

Are there any other alternative city bus tours available? We would love an easy way to see Reykjavik that's informational too. We know the city is walkable for most, but a bus tour is ideal due to people having some slight mobility issues.

Thank you!