The closest major brand to Tamarindo is the JW Marriott Guanacaste Resort & Spa in Hacienda Pinilla on Playa Mansita next to Playa Avellana.
At low tide, you can walk from Tamarindo Beach to the JW Marriott in about 1.5 hours though this is not for everyone. I have done it, but it requires crossing an river mouth (there are crocodiles in the rivers and there is a tiny risk that they could get lost and end up at the river mouths) on Playa Langosta, walking over many rocks area between the beaches and probably walking for long stretches without seeing another human.
Driving between the JW and Tamarindo takes about 30 minutes as you need to go pretty far inland for the roads to connect.
The Marriott’s beach itself is very small, but it is only about 10 minute walk on the beach (at least during low tide) to Playa Avellana which is huge and very nice. At the other end of Playa Avellana (maybe another 10 minutes or so) is a famous restaurant called Lolas which is a great place to have a $10 drink and watch the sun set. Though be careful not to stay too long as you may not want to do the walk back once it is pitch dark.
The JW is part of a private golf community Hacienda Pinilla nestled in Marino Las Baulas National Park.
I briefly visited in April of 2021. If you are looking for a place to social distance, this is it. On one afternoon there may have been 10 people total in the entire pool area (which they claim to be the largest in Central America). It felt a bit like a ghost town, but many people will like that during COVID.
Summary: this would be a great place to go if you have Bonvoy points and like out of the way resorts or even as a place to recharge after spending some days hiking Guanacaste’s national parks or having very full days and nights in Tamarindo. Personally, I would prefer to stay in Tamarindo. While Tamarindo is expensive for Costa Rica, it will feel normal or cheap compared to large US cities and there is plenty of competiton for most every good or service you want.
More info on Marriott’s website
Pictures from April 2021
Costa Rica Hotel Travel Marriott Bonvoy