It's our first time in Costa Rica and Manuel Antonio Nat'l Park was our first thing to do in the country. We didn't know what to expect from a tour, and being inveterate DIY-ers, we were worried we might regret the choice to hire a guide. Turns out to be the best decision we could have made. Pablo (Paul) was the best--using his telescope, he showed us everything from the tiniest insect to hidden bats to sloths and monkeys, and could explain it all knowledgably in fluent English. I can say with certainty that we wouldn't have seen anything other than a few bugs without him. He's also a delightful person to hang with-- interacted with our kids (13 and 15) really well, kept them involved and entertained, and had lots to say about Oregon, where we're from, especially our Oregon Ducks! In fact, we scheduled a mangrove kayak tour with his company the next day and that was equally great. Can't recommend enough!