If you are planning a day trip then perhaps consider a drive up to the Bukit ( near Uluwatu ) to spend the day at Finn’s Beach Club. Entrance is via the Semara Luxury Villa’s and it is $25 USD per adult ( kids under 12 free) which is redeemable for food and drinks. You can enjoy the sun lounges and a swim for the day. There are many stairs to go down and you have a ride in the inclinator which was my favourite part. This place is not cheap , however it is beautiful , plan to get there around 9 to ensure a lounge, it can get busy on the weekends. You can actually walk along the beach to the Nammos Beach Club. I personally prefer Finn’s xxx.
It is an amazing place, but if you are not fit and over 65, I suggest you give it a big miss.