Two kinds I wear.

Orvis Jackson pants were made for exactly what you are describing - they are quite comfortable and they look good enough to stop at a diner or family restaruant - so you won't scare any mothers or little kids! LOL
http://www.orvis.com/p/quick-dry-jackson-pants/2c0as

The other type are the zip off convert to shorts. Mine are Columbia and they are great.