I would like to try longboarding, mainly for cruising around local parks, maybe to get around locally where bicycle is too inconvenient. ya know, the trips where too short for bicycle, but too long to walk?

However, how forgiving are longboards in comparison to skateboards? Do they easily get hung up on cracks, stones, or twigs for example?
What brands should I be looking at?
What stores do you recommend for longboards? The usual skate shops i used in the past don't seem to carry much, and I have no idea if they're decent or just random names?
Any other tips you can think of?