This plant is Bottlebrush Buckeye, one of the plants on your plan.
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Sometimes a simple naturalistic fire ring is best. I can see this toward the creek. It' similar to the fire pit you have now. The biggest difference is there would be no wall between fire pit and creek.
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The landscape plan shows a fire bowl. This option is also fitting for your site.
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Fire bowl on pebble surface
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I like this simple stainless grill with stone and wood cabinet door under the grill.
This small table and chairs is also nice.
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Example of chairs around a small table on a pebble surface.
Example of perennial mix.
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