Scotiabank place questions

Hi. We are visiting Toronto for a concert in February and staying at the Radisson Blu.

1) can we walk underground from this hotel to Scotiabank place? If so, where do find the tunnels? 2) are these tunnels also like shopping malls? 3) if we can’t walk underground to scotiabank place, is there underground shopping in the area? We would like to do some shopping before we return home the next day 4) we are dropping our teens off at the concert and will then have a date night while the teens are at the concert. Can anyone suggest a nice restaurant or activity to fill the 3 hours or so in the area?

Thanks in advance!