Awesome day trip!
We started at 9am with a 40 min ride on a small boat to the isla. Then we went snorkeling with sea lions!! They were everywhere around us! Also a great spot for diving!
Then we took a break on a lonely beach on the smaller isla next to Espiritu Santo, had lunch there and then went snorkeling a second time where we saw sea turtles before heading back around 5pm :)
Overall great day trip! Totally recomendable!
Hint: always negotiate with the organizations or fisher men who want to bring you there. Prices range from 400 to over 1000 pesos per person!