re: Non Beach Travel Ideas for Spring Break?

Depending on where you are driving from Tahoe is quite a haul.

Most of the Rockies will still have snow in April, however Utah and Arizona will be mostly snow free, although chilly at night.

The southern Utah parks would probably be your best bet in the US if you want to hike/backpack in April.

This dude started an around the world honeymoon in early April with a traverse of the Hayduke trail (800 miles across southern Utah and Arizona).

His instagram pics give you a good idea of the weather to expect. Warning: viewing these pics will probably end your search for a destination.

(the most current pics are in Europe, scroll down until you see the familiar slot canyons and hoodoos of the southwest and read through all of those posts. It looks incredible that time of year, plus zero crowds)

eta: some of the pics right before (around May) you get to the Utah pics are from his coast to coast traverse across Scotland. They are also impressive.