In a large bowl, toss the shrimp with olive oil, garlic powder, paprika, salt, and pepper until evenly coated.
Heat a skillet over medium-high heat. Add the shrimp and cook for 2-3 minutes on each side, or until they turn pink and opaque. Remove from heat.
In a separate bowl, combine the diced pineapple, red bell pepper, red onion, cilantro, and lime juice. Mix well to create the salsa.
To assemble the bowls, place a serving of cooked rice at the bottom of each bowl. Top with cooked shrimp and a generous scoop of pineapple salsa.
If desired, add sliced avocado on top for extra creaminess. Serve immediately.