The biggest island is Trinidad. Tobago is a lot smaller and less populated. The islands are popular with sun-loving tourists; Maracas Beach is the most popular beach on Trinidad. Though there are dozens of them, some of which are desert.
It’s also a great place for walking. You could take a hike to Pigeon Peak on Tobago, for example. This is almost 600 metres high and has a great view over the islands.
An easy walk is the track to the Argyle Waterfalls, also on Tobago. You walk fifteen minutes through the rainforest to get to the falls, and when you get there, you can jump straight in.