Mini roundtrip LV in Feb

[Funq]

Hi all,

Me and a colleague will be attending a conference in LV in February and we figured it would be a good idea to start off with a small trip before the conference. Due to money and time constraints we are limited to a 4 day trip.

We are currently looking at several options and some advice would be much appreciated (coming from the Netherlands, I am a bit lost as to what sources to consult).

Our options are:
1. Fly to LV and do a round trip. Probably eastwards towards Zion, Bryce and grand Canyon.

2. Fly to Phoenix and go north. Again with Bryce and Grand Canyon.

3. Fly to Salt Lake City and drive south.

Clearly we planned this with the big tourist attractions in mind, but any suggestion for "off the beaten track" sightseeing might make it all the more memorable.

Thanks for reading and any tips you all might have!

Ruud