?Costa Rica uses 110 volt, 60 cycle electricity, same as the US. Plugs are typically the 2-pronged flat type, so US travelers will not typically need a converter or adapter.
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It's completely safe to drink the tap water over the majority of the country. That includes your luxury vacation rentals in Guanacaste! Costa Rica is quite notable in Latin America as 92.5% of the population has access to drinking water.
You're free to add something extra if you think it's warranted, but if you calculate your tip as a percentage of the entire bill, you'll be tipping on the 23% already added for taxes and service. Still, no tip will be unappreciated, even if it's 1,000 or 2,000 colones ($1.50 or $3).