Streamline the character's sheet: remove all competencies, do not plan skill challenge. If skill is needed, improvise a test using the characteristic + half level of the relevant class, otherwise nothing.
For example: for any outdoor survival skill (tracking, identify animal/plant, build), only druid, barbarian and ranger can take it.
For social skills (psychology, detect lie, interrogation & cie), only bards, priest...
It is rough, but it is simple and will meet their requirements.
Or even more simple, don't do skill roll: if they have the required class in their group just say "The ranger, with his keen eyes spots the trail left by the gobs. However, he is not sure of their number", or "Despite your best efforts your are not able to get information in these streets: either nobody knows what you are looking for, or they are so scared that they refuse to talk to you".
Of course, makes pre-gen, maybe level 3, so there is a bit of varieties in powers without being overwhelming. Have Power cards ready for each of them (there is various free software on the net which let you print or customise those).
Then have a good scenario, even if it is only hack and slash: they could play a group of orcs and gobelins (don't bother with racial abilities, just reskin barbarian, ranger, shaman or fighter for orcs, and thief, sorcerer for gobs) with the task of gathering intel on a tower in the swamp, which will make a good spots for an advanced outpost.
They might get attacked by another clan of orcs who also want to control the tower, they might fall on a human caravan which was ambush by something (which would let them think that the swamp is not unhabited) and some jellies or other mindless creatures transported by the caravan are still around, etc...
I just found that outdoor hack slash is more interesting than the basic door/room/monster/treasure.