Marriott Prague and Marriott Munich
 

I am redeeming some points for 3 night stay in Prague and one night in Munich Marriotts.

Any info (good or bad) on what to expect and any good ideas for things to do in Prague?

In Prague, I would highly reccomend taking in a concert or an opera.

Or a half-liter of Pilsner Urquell for a buck fifty. :D

Ditto to both of the suggestions. There is a GREAT restaurant near the Marriott Praha, just adjacent to the "diving board pig" (cant miss it). Not bad prices and the chef had an amazing menu. The orloj is worth seeing, especially if it will be changing when you are there. Prague Castle (Pražský hrad) was also worth the visit if you have time. Have fun and enjoy super cheap beer!

Well I am traveling with family this time :/

I might cancel Marriott Munich due to the fact they can't confirm 2 double non-smoking for me :( (I have asthma and there will be 4 of us this time).

Near to the Prague Marriott is Celnice, a bar at the end of the street in Namestie Republicky is a great place to sink a nice big 1 litre glass of Urquell and they do some good food too :D

They even have a club in the basement.