If you have hills, the fact that the bike is likely a heavy gaspipe frame with 26 in balloon tires and single speed with coaster rear brake only may make the ride more work than on a lighter geared bike. Most beach cruisers have wide upturned bars with limited hand positions and a wide seat, meant to accommodate unconditioned vacationers who are in no hurry to go anywhere, they would be difficult to get decent speed or to ride into wind with.

You could do it, but I doubt it would be that much fun.