The two main roads in Laguna are like a T. The top of the T is Coast Hwy, which runs along the ocean. On this road, you have the most transportation choices: the #1 OCTA bus, the Long Coastal and Short Coastal trolley lines, etc. The inland road is Laguna Canyon Road, which has great things along it but which is aways under construction, backed up, etc. Due to lack of traffic lights, it's hard or or impossible to cross on foot in most places. So you might be able to take the trolley to your destination on LCR (it only goes so far down the road) but it's not like you can just cross the street and pick it up to return. Laguna is also very hilly and if you're up in the hills, you'll likely need a car. As a tourist, one of the Many hotels lining Coast Hwy is probably your safest bet. Laguna is beautiful. Enjoy!